Santiago Torres Gil

Associate professor
Campus Baix Llobregat (UPC), Edifici C3, Despatx 111
Esteve Terradas, 5
08860 Castelldefels

Telèfon: +34 934134154
E-Mail: santi

fa.upc.edu
Web del grup de recerca: http://gaa.upc.edu
Web personal: http://futur.upc.edu/SantiagoTorresGil

Santiago Torres is an Associate Professor in the Physics Department, a position he has held since 2008, where he has built an extensive career in research and teaching. Dr. Torres research interests are primarily focused on astronomy and astrophysics, particularly on the study of white dwarfs - peculiar, highly dense objects that are remnants of stars like our Sun. Using Monte Carlo techniques, Dr. Torres developed a detailed population synthesis model of the white dwarf population in our Galaxy. In parallel, he has applied novel artificial intelligence techniques, such as neural networks and random forest algorithms, to catalog large samples of astronomical data. In addition, Dr. Torres has accumulated extensive teaching experience in undergraduate and masters courses over nearly 30 years, covering subjects such as Algebra and Analysis, Physics, Mechanics, Fluid Mechanics, Aerodynamics, Space Systems Engineering, Computational Astrophysics, and, more recently, Quantum Computing Technologies.

Short CV

2008 - present: Associate professor. Department of Physics, Universitat Politècnica de Catalunya.
2004 - 2008: Lector-doctor (tenure track) position. Department of Applied Physics, Universitat Politècnica de Catalunya.
2002 - 2003: Postdoctoral fellow at the Max Planck Institute für Astronomie, Heidelberg, Germany
2002: PhD in the Advanced Physics program. Department of Applied Physics, Universitat Politècnica de Catalunya.
1996 - 2004: Assistant professor at the Escola Universitaria Politècnica de Mataró
1989 - 1993: Degree on Physics. University of Barcelona.

1- A population synthesis study of the Gaia 100 pc unresolved white dwarf-main-sequence binary population
Santos, A.; Torres, S.; Rebassa, A.; Brown, A.
Astronomy & astrophysics 695, article A161 (2025)

2- Exsolution process in white dwarf stars
Camisassa, M.; Baiko, D.; Torres, S.; Rebassa, A.
Astronomy & astrophysics 683, A101 (2024)

3- J0526+5934: A peculiar ultra-short-period double white dwarf
Rebassa, A.; Hollands, M.; Parsons, S.G.; Althaus, L. G.; Pelisoli, I.; Irawati, P.; Raddi, R.; Camisassa, M.; Torres, S.
Astronomy & astrophysics 686, A221 (2024)

4- Kinematic origin of white dwarfs in the solar neighborhood
Zubiaur, A.; Raddi, R.; Torres, S.
Astronomy & astrophysics 687, A286 (2024)

5- Main sequence dynamo magnetic fields emerging in the white dwarf phase
Camisassa, M.; Fuentes, J.; Schreiber, M.; Rebassa, A.; Torres, S.; Raddi, R.; Domínguez, I.
Astronomy & astrophysics 691, article L21 (2024)

6- White dwarf random forest classification through Gaia spectral coefficients
Garcia, E.; Torres, S.; Rebassa, A.
Astronomy & astrophysics 679, article 127 (2023)

7- Main-sequence companions to white dwarfs - II. The age-activity-rotation relation from a sample of Gaia common proper motion pairs
Rebassa, A.; Maldonado, J.; Raddi, R.; Torres, S.; Hoskin, M.; Cunningham, T.; Hollands, M.; Ren, J.; Gänsicke, B. T.; Tremblay, P.; Camisassa, M.
Monthly notices of the Royal Astronomical Society 526, 4787-4800 (2023)

8- The unusual planetary nebula nucleus in the Galactic open cluster M37 and six further hot white dwarf candidates
Werner, K.; Reindl, N.; Raddi, R.; Griggio, M.; Bedin, L.; Camisassa, M.; Rebassa, A.; Torres, S.; Goodhew, P.
Astronomy & astrophysics 678, A89 (2023)

9- General relativistic pulsations of ultra-massive ZZ Ceti stars
Córsico, A. H.; Boston, R.; Althaus, L. G.; Kilic, M.; Kepler, S.; Camisassa, M.; Torres, S.
Monthly notices of the Royal Astronomical Society 524, 5929-5943 (2023)

10- White dwarf spectral type-temperature distribution from Gaia DR3 and the Virtual Observatory
Torres, S.; Cruz, P.; Murillo, R.; Jiménez, F.; Rebassa, A.; Solano, E.; Camisassa, M.; Raddi, R.; Doliguez, J.
Astronomy & astrophysics 677, Article 159 (2023)

11- Carbon-oxygen ultra-massive white dwarfs in general relativity
Althaus, L. G.; Corsico, A.; Camisassa, M.; Torres, S.; Gil Pons, P.; Rebassa, A.; Raddi, R.
Monthly notices of the Royal Astronomical Society 523, 4492-4503 (2023)

12- A hidden population of white dwarfs with atmospheric carbon traces in the Gaia bifurcation
Camisassa, M.; Torres, S.; Hollands, M.; Koester, D.; Raddi, R.; Althaus, L. G.; Rebassa, A.
Astronomy & astrophysics 674, A213 (2023)

13- Spectral classification of the 100 pc white dwarf population from Gaia-DR3 and the virtual observatory
Jiménez, F.; Torres, S.; Rebassa, A.; Cruz, P.; Murillo, R.; Solano, E.; Rodrigo , C.; Camisassa, M.
Monthly notices of the Royal Astronomical Society 518, 5106-5122 (2023)

14- A population synthesis fitting of the Gaia resolved white dwarf binary population within 100 pc
Torres, S.; Canals, P.; Jiménez, F.; Rebassa, A.; Solano, E.
Monthly notices of the Royal Astronomical Society 511, 5462-5474 (2022)

15- Can we reveal the core-chemical composition of ultra-massive white dwarfs through their magnetic fields?
Camisassa, M.; Raddi, R.; Althaus, L. G.; Isern, J.; Rebassa, A.; Torres, S.; Córsico, A. H.; Korre, L.
Monthly Notices of the Royal Astronomical Society: Letters 516, L1-L6 (2022)

16- Random forest classification of Gaia DR3 white dwarf-main sequence spectra: a feasibility study
Echeverry, D.; Torres, S.; Rebassa, A.; Ferrer i Burjachs, A.
Astronomy & astrophysics 667, A144 (2022)

17- White dwarfs as physics laboratories: lights and shadows
Isern, J.; Torres, S.; Rebassa, A.
Frontiers in Astronomy and Space Sciences 9, 815517 (2022)

18- Forever young white dwarfs: When stellar ageing stops
Camisassa, M.; Althaus, L. G.; Torres, S.; Córsico, A. H.; Rebassa, A.; Tremblay, P.; Cheng, S.; Raddi, R.
Astronomy & astrophysics 649, L7 (2021)

19- White dwarf-main-sequence binaries from Gaia EDR3: The unresolved 100 pc volume-limited sample
Rebassa, A.; Solano, E.; Jiménez, F.; Torres, S.; Rodrigo , C.; Ferrer i Burjachs, A.; Calcaferro, L.; Althaus, L. G.; Córsico, A. H.
Monthly notices of the Royal Astronomical Society 506, 5201-5211 (2021)

20- The formation of ultra-massive carbon-oxygen core white dwarfs and their evolutionary and pulsational properties
Althaus, L. G.; Gil Pons, P.; Córsico, A. H.; Camisassa, M.; Miller, M.; de Geronimo, F.; Torres, S.; Gutierrez, J.; Rebassa, A.
Astronomy and astrophysics 646, A30 (2021)

21- The pulsational properties of ultra-massive DB white dwarfs with carbon-oxygen cores coming from single-star evolution
Córsico, A. H.; Gil Pons, P.; Torres, S.; Althaus, L. G.
Astronomy and astrophysics 646, A60 (2021)

22- The White Dwarf Binary Pathways Survey. V. The Gaia White Dwarf plus AFGK Binary Sample and the Identification of 23 Close Binaries
Ren, J.; Raddi, R.; Rebassa, A.; Parsons, S.G.; Irawati, P.; Schreiber, M. R.; Gänsicke, B. T.; Torres, S.
The astrophysical journal letters 905, 38 (2020)

23- The effects of unresolved double degenerates in the white dwarf luminosity function
Rebassa, A.; Torres, S.; Toonen, S.; Canals, P.
Monthly notices of the Royal Astronomical Society 491, 5671-5681 (2020)

24- Accurate mass and radius determinations of a cool subdwarf in an eclipsing binary
Rebassa, A.; Parsons, S.G.; Dhillon, V.S.; Ren, J.; Littlefair, S.P.; Marsh, T.R.; Torres, S.
Nature Astronomy , (2019)

25- Where are the double-degenerate progenitors of Type Ia supernovae?
Rebassa, A.; Toonen, S.; Korol, V.; Torres, S.
Monthly notices of the Royal Astronomical Society 482, 3656-3668 (2019)

26- Random Forest identification of the thin disc, thick disc, and halo Gaia-DR2 white dwarf population
Torres, S.; Cantero, C.; Rebassa, A.; Skorobogatov, G.; Jiménez, F.; Solano, E.
Monthly notices of the Royal Astronomical Society 485, 5573-5589 (2019)

27- Effects of Ne-22 sedimentation and metallicity on the local 40 pc white dwarf luminosity function
Tononi, J.; Torres, S.; García-Berro, E.; Camisassa, M.; Althaus, L. G.; Rebassa, A.
Astronomy & astrophysics 628, 52 (2019)

28- Gaia DR2 white dwarfs in the Hercules stream
Torres, S.; Cantero, C.; Camisassa, M.; Antoja, T.; Rebassa, A.; Althaus, L. G.; Thelemaque, T.; Canovas, H.
Astronomy & astrophysics 629, L6 (2019)

29- Infrared-excess white dwarfs in the Gaia 100 pc sample
Rebassa, A.; Solano, E.; Xu, S.; Rodrigo , C.; Jiménez, F.; Torres, S.
Monthly notices of the Royal Astronomical Society 489, 3990-4000 (2019)

30- Oxygen-neon-rich merger during common envelope evolution
Canals, P.; Torres, S.; Soker, N.
Monthly notices of the Royal Astronomical Society 480, 4519-4525 (2018)

31- Axions and the luminosity function of white dwarfs : the thin and thick discs, and the halo
Isern, J.; Garcia-berro, E.; Torres, S.; Cojocaru, E.; Catalán, S.
Monthly notices of the Royal Astronomical Society 478, 2569-2575 (2018)

32- The population of single and binary white dwarfs of the Galactic bulge
Torres, S.; Garcia-berro, E.; Cojocaru, E.; Calamida, A.
Monthly notices of the Royal Astronomical Society 476, 1654-1662 (2018)

33- A white dwarf catalogue from Gaia-DR2 and the Virtual Observatory
Jiménez, F.; Torres, S.; Rebassa, A.; Skorobogatov, G.; Cantero, C.
Monthly notices of the Royal Astronomical Society 480, 4505-4518 (2018)

34- The evolution of white dwarfs resulting from helium-enhanced, low-metallicity progenitor stars
Althaus, L. G.; de Geronimo, F.; Córsico, A. H.; Torres, S.; Garcia-berro, E.
Astronomy & astrophysics 597, A&A (2017)

35- The population of white dwarf-main sequence binaries in the SDSS DR 12
Cojocaru, E.; Rebassa, A.; Torres, S.; Garcia-berro, E.
Monthly notices of the Royal Astronomical Society 470, 1442-1452 (2017)

36- The kinematics of the white dwarf population from the SDSS DR12
Anguiano, B.; Rebassa, A.; Garcia-berro, E.; Torres, S.; Freeman, K.; Zwitter, T.
Monthly notices of the Royal Astronomical Society 469, 2102-2120 (2017)

37- Updated evolutionary sequences for hydrogen-deficient white dwarfs
Camisassa, M.; Althaus, L. G.; Rohrmann, R.; Garcia-berro, E.; Torres, S.; Corsico, A.; Wachlin, F.
The astrophysical journal letters 839, 11 (2017)

38- The white dwarf population within 40 pc of the Sun
Torres, S.; Garcia-berro, E.
Astronomy & astrophysics 588, (2016)

39- Revisiting the luminosity function of single halo white dwarfs
Cojocaru, E.; Torres, S.; Althaus, L. G.; Isern, J.; Garcia-berro, E.
Astronomy & astrophysics 581, A108 (2015)

40- The white dwarf population of NGC 6397
Torres, S.; Garcia-berro, E.; Althaus, L. G.; Camisassa, M.
Astronomy & astrophysics 581, (2015)

41- DA white dwarfs from the LSS-GAC survey DR1: the preliminary luminosity and mass functions and formation rate
Rebassa, A.; Cojocaru, E.; Torres, S.; Garcia-berro, E.; Liu, X.; Yuan, H.; Xiang, M.; Huang, Y.; Koester, D.; Hou, Y.; Li, G.; Zhang, Y.
Monthly notices of the Royal Astronomical Society 450, 743-762 (2015)

42- A population synthesis study of the MS+WD population in the SDSS
Garcia-berro, E.; Torres, S.; Camacho, J.; Rebassa, A.; Gänsicke, B. T.; Schreiber, M. R.; Zorotovic, M.
Astronomical Society of the Pacific conference series 493, 361-365 (2015)

43- The white dwarf cooling sequence of 47 Tucanae
Garcia-berro, E.; Torres, S.; Althaus, L. G.; Miller, M.M
Astronomy and astrophysics 571, A56-1-A56-5 (2014)

44- Monte Carlo simulations of post-common-envelope white dwarf + main sequence binaries: The effects of including recombination energy
Zorotovic, M.; Garcia-berro, E.; Schreiber, M. R.; Camacho, J.; Torres, S.; Rebassa, A.; Gänsicke, B. T.
Astronomy and astrophysics 568, id. A68 (2014)

45- Monte Carlo simulations of post-common-envelope white dwarf plus main sequence binaries: comparison with the SDSS DR7 observed sample
Camacho, J.; Torres, S.; Garcia-berro, E.; Zorotovic, M.; Schreiber, M. R.; Rebassa, A.; Nebot, A.; Gänsicke, B. T.
Astronomy and astrophysics 566, 14 (2014)

46- The effects of metallicity on the Galactic disk population of white dwarfs
Cojocaru, E.; Torres, S.; Isern, J.; Garcia-berro, E.
Astronomy and astrophysics 566, id.A81 (2014)

47- A population synthesis study of the luminosity function of hot white dwarfs
Torres, S.; Garcia-berro, E.; Krzesinski, J.; Kleinman, S.J
Astronomy and astrophysics 563, A&A (2014)

48- Explaining the Type Ia supernova PTF 11kx with a violent prompt merger scenario
Garcia-berro, E.; Torres, S.; Camacho, J.; Soker, N.; Kashi, A.
Monthly notices of the Royal Astronomical Society 431, 1541-1546 (2013)

49- An upper limit to the secular variation of the gravitational constant from white dwarf stars
Garcia-berro, E.; Loren, P.; Torres, S.; Althaus, L. G.; Isern, J.
Journal of cosmology and astroparticle physics 2011, 5 (2011)

50- The white-dwarf cooling sequence of NGC 6791: a unique tool for stellar evolution
Garcia-berro, E.; Torres, S.; Renedo, I.; Camacho, J.; Althaus, L. G.; Córsico, A. H.; Salaris, M.; Isern, J.
Astronomy and astrophysics 533, A31 (2011)

51- Double degenerate mergers as progenitors of high-field magnetic white dwarfs
Garcia-berro, E.; Loren, P.; Aznar, G.; Torres, S.; Camacho, J.; Althaus, L. G.; Córsico, A.H.; Kulebi, B.; Isern, J.
Astrophysical journal 749, 1 (2011)

52- The evolution of white dwarfs with a varying gravitational constant
Althaus, L. G.; Corsico, A.; Torres, S.; Loren, P.; Isern, J.; Garcia-berro, E.
Astronomy and astrophysics 527, A72 (2011)

53- "The Cooling of White Dwarfs and a Varying Gravitational Constant"
Garcia-berro, E.; Althaus, L. G.; Torres, S.; Loren, P.; Corsico, A.; Isern, J.
Astrophysics and space science proceedings , 47-57 (2011)

54- White dwarfs with hydrogen-deficient atmospheres and the dark matter content of the Galaxy
Torres, S.; Camacho, J.; Isern, J.; Garcia-berro, E.
Astronomy and astrophysics 511, 1-11 (2010)

55- Monte Carlo simulations of the post-common-envelope white-dwarf main-sequence binary population
Camacho, J.; Torres, S.; Garcia-berro, E.; Zorotovic, M.; Schreiber, M. R.
AIP Conference proceedings 1314, 22-23 (2010)

56- A white dwarf cooling age of 8 Gyr for NGC 6791 from physical separation processes
Garcia-berro, E.; Torres, S.; Althaus, L.G.; Renedo, I.; Loren, P.; Corsico, A.; Rohrmann, R.D.; Salaris, M.; Isern, J.
Nature 465, 194-196 (2010)

57- Axions and the white dwarf luminosity function
Isern, J.; Catalán, S.; Garcia-berro, E.; Torres, S.
Journal of physics: conference series 172, 1 (2009)

58- "On the origin of white dwarfs with carbon-dominated atmospheres: the case of H1504+65"
Althaus, L.; Corsico, A.; Torres, S.; Garcia-berro, E.
Astronomy and astrophysics 494, 1021-1024 (2009)

59- Monte Carlo simulations of the binary white dwarf population: a progress report
Camacho, J.; Torres, S.; Garcia-berro, E.
Journal of physics: conference series 172, 1 (2009)

60- White dwarfs, red dwarfs and halo dark matter
Garcia-berro, E.; Torres, S.; Camacho, J.; Isern, J.
Journal of physics: conference series 172, 12003-12003 (2009)

61- The contribution of red dwarfs and white dwarfs to the halo dark matter
Torres, S.; Camacho, J.; Isern, J.; Garcia-berro, E.
Astronomy and astrophysics 486, 427-435 (2008)

62- "Axions and the cooling of white dwarfs stars"
Garcia-berro, E.; Torres, S.
Astrophysical journal 682, L109-L112 (2008)

63- The contribution of Oxygen-Neon white dwarfs to the MACHO content of the Galactic halo
Camacho, J.; Torres, S.; Villaboy, I.; Althaus, L.; Garcia-berro, E.
Astronomy and astrophysics 471, 151-158 (2007)

64- The white dwarf luminosity function - II. The effect of the measurement errors and other biases
Torres, S.; Garcia-berro, E.; Isern, J.
Monthly notices of the Royal Astronomical Society 378, 1461-1470 (2007)

65- The white dwarf luminosity function . I. Statistical errors and alternatives
Geijo, E.; Torres, S.; Vilaboy, I.; Garcia-berro, E.
Monthly notices of the Royal Astronomical Society 369, 1654-1666 (2006)

66- "Simulating Gaia performances on white dwarfs"
Torres, S.; Garcia-berro, E.
Monthly notices of the Royal Astronomical Society 360, 1381-1392 (2005)

67- "Monte Carlo simulations of the halo white dwarf population"
Garcia-berro, E.; Torres, S.
Astronomy and astrophysics 418, 53-66 (2004)

68- "Using Self Organizing Maps to identify potential halo white dwarfs"
Garcia-berro, E.; Torres, S.
Neural networks 16, 405-410 (2003)

69- "High Proper Motion White Dwarfs and Halo Dark Matter"
Torres, S.; Garcia-berro, E.
Monthly notices of the Royal Astronomical Society 336, 971-978 (2002)

70- "The impact of a merger episode in the galactic disk white dwarf population"
Torres, S.; Garcia-berro, E.
Monthly notices of the Royal Astronomical Society 328, 492-500 (2001)

71- "On the white dwarf distances to Galactic Globular Clusters"
Garcia-berro, E.; Torres, S.
Astronomy and astrophysics 371, 921-931 (2001)

72- "GAIA Science output: white dwarfs"
Figueras, F.; Garcia-berro, E.; Torra, J.; Jordi, C.; Luri, X.; Torres, S.; Chen, B.
Baltic astronomy 8, 291-299 (1999)

73- "Monte Carlo simulations of the disk white dwarf population"
Garcia-berro, E.; Torres, S.
Monthly notices of the Royal Astronomical Society 302, 173-188 (1999)

74- "Neural network identification of halo white dwarfs"
Torres, S.; Garcia-berro, E.
Astrophysical journal 508, L71-L74 (1998)

75- "The halo white dwarf population"
Garcia-berro, E.; Torres, S.
Astrophysical journal 503, 239-246 (1998)