Asteroseismology Research Collaboration is dedicated to understanding the pulsating hot subdwarf stars.
The ARDASTELLA collaboration focuses on cutting-edge research projects related to pulsations in hot subdwarf stars (sdB stars). Our primary goal is to deliver groundbreaking discoveries that contribute to the understanding of the structure and evolution of these fascinating celestial objects.
We utilize advanced asteroseismological techniques, which involve studying the oscillations of stars to probe their interiors, much like seismologists study earthquakes to understand Earth's interior. This allows us to gain unprecedented insights into stellar physics.
Subdwarf B (sdB) stars are a class of hot, compact stars that lie on the extreme horizontal branch of the Hertzsprun-Russell diagram. They are characterized by their small size (about 0.1 to 0.2 solar radii), high surface temperatures (20,000 to 40,000 K), and luminosities much lower than typical main-sequence stars.
These stars are evolved objects, having shed most of their hydrogen envelope during their red giant phase. Their cores are composed primarily of helium, which is undergoing nuclear fusion. Understanding their formation and evolution is crucial for stellar population synthesis and galactic archaeology.
The discovery of pulsating sdB stars has opened a new window into their interiors, allowing us to use asteroseismology to probe their internal structure, composition, and dynamics with unprecedented precision.
Co-head of the collaboration
Observer and data interpreter, including ground telescopes as well as Kepler and TESS space missions.
Co-head of the collaboration
Observer and data interpreter, including ground telescopes as well as Kepler and TESS space missions.
Graduate student
Undergraduate student
Undergraduate student
Undergraduate student
International collaborator
International collaborator of Astroserver.org; supporting spectroscopic observations and data processing.
International member
International member at Nordic Optical Telescope; supporting spectroscopic observations and data processing.
International collaborator
International collaborator from Norway; observer and data interpreter, supporting analysis of spectroscopic data.
Sahoo S.K., Baran A.S., Németh P., Worters H.L., Pramod Kumar S., Joshi S., Kilkenny D.
2024, Publications of the Astronomical Society of Australia, 41
DOI: 10.1017/pasa.2024.38
Baran A.S., Charpinet S., Østensen R.H., Reed M.D., Van Grootel V., Lyu C., Telting J.H., Németh P.
2024, Astronomy & Astrophysics, 685, 65
DOI: 10.1051/0004-6361/202348571
Kilkenny D., Worters H.L., Baran A.S.
2024, Monthly Notices of the Royal Astronomical Society, 527, 8402
DOI: 10.1093/mnras/stad3544
Green M.J., Hermes J.J., Barlow B.N., Marsh T.R., Pelisoli I., Gänsicke B.T., Kaiser B.C., Romero A., Amaral L.A., Corcoran K., Grupe D., Kennedy M.R., Kepler S.O., Munday J., Ashley R.P., Baran A.S., Breedt E., Brown A.J., Dhillon V.S., Dyer M.J., Kerry P., King G.W., Littlefair S.P., Parsons S.G., Sahman D.I.
2024, Monthly Notices of the Royal Astronomical Society, 527, 3445
DOI: 10.1093/mnras/stad3412
Baran A.S., Van Grootel V., Østensen R.H., Worters H.L., Sahoo S.K., Sanjayan S., Charpinet S., Németh P., Telting J.H., Kilkenny D.
2023, Astronomy & Astrophysics, 669, 48
DOI: doi.org/10.1051/0004-6361/202244888
Reed M.D., Baran A.S., Telting J.H., Østensen R.H.
2023, Monthly Notices of the Royal Astronomical Society, 525, 1342
DOI: doi.org/10.1093/mnras/stad2392
Baran A.S., Sanjayan S.
2023, Acta Astronomica, 73, 21
DOI: 10.32023/0001-5237/73.1.2
Munday J., Tremblay P.-E., Hermes J.J., Barlow B., Pelisoli I., Marsh T.R., Parsons S.G., Jones D., Kepler, S.O., Worters H.L.
2023, Monthly Notices of the Royal Astronomical Society, 525, 1814
DOI: 10.1093/mnras/stad2347
Guzik J.A., Baran A.S., Sanjayan S., Németh P., Hedlund A.M., Jackiewicz J., Dauelsberg L.R.
2023, The Astrophysical Journal, 165, 188
DOI: 10.3847/1538-3881/acc0f0
Sahoo S.K., Baran A.S., Worters H.L., Németh P., Kilkenny D.
2023, Monthly Notices of the Royal Astronomical Society, 519, 2486
DOI: 10.1093/mnras/stac3676
Córsico A.H., Uzundag M., Kepler S.O., Althaus L.G., Silvotti R., Bradley P.A., Baran A.S., Koester D., Bell K.J., Hermes J.J., Gentilo Fusillo N.P.
2022, Astronomy & Astrophysics, 668, 161
DOI: 10.1051/0004-6361/202244198
Silvotti R., Németh P., Telting J.H. Baran A.S., Østensen R.H., Ostrowski J., Sahoo S.K., Prins S.
2022, Monthly Notices of the Royal Astronomical Society, 511, 2201
DOI: 10.1093/mnras/stac160
Sanjayan S., Baran A.S., Németh P., Kinemuchi K.
2022, Acta Astronomica, 72, 267
DOI: 10.32023/0001-5237/72.4.3
Sanjayan S., Baran A.S., Németh P., Kinemuchi K., Ostrowski J., Sahoo S.K.
2022, Acta Astronomica, 72, 77
DOI: 10.32023/0001-5237/72.2.1
Sanjayan S., Baran A.S., Ostrowski J., Németh P., Pelisoli I., Østensen R.H., Kern J.W., Reed M.D., Sahoo S.K.
2022, Monthly Notices of the Royal Astronomical Society, 509, 763
DOI: 10.1093/mnras/stab2985
Romero A.D., Kepler S.O., Hermes J.J., Baran A., Pelisoli I., Oliveira G., Koester D., Klippel T.S., Fraga L., Bradley, P.A., Vučković M., Heintz T.M., Reding J.S., Kaiser B.C., Charpinet S.
2022, Monthly Notices of the Royal Astronomical Society, 511, 1574
DOI: 10.1093/mnras/stac093
Córsico A.H., Uzundag M., Kepler S.O., Althaus L.G., Silvotti R., Baran A.S., Bell K.J., Bischoff-Kim A., Hermes J.J., Kawaler S.D., Provencal J.L., Winget D.E., Montgomery M.H., Bradley P.A., Kleinman S.J., Nitta A.
2022, Astronomy & Astrophysics, 659, 30
DOI: 10.1051/0004-6361/202142153
Reed M.D., Slayton A., Baran A.S., Telting J.H., Østensen R.H., Jeffery C.S., Uzundag M., Sanjayan S.
2021, Monthly Notices of the Royal Astronomical Society, 507, 4178
DOI: 10.1093/mnras/stab2405
Uzundag M., Vučković M., Németh P., Miller Bertolami M., Silvotti R., Baran A.S., Telting J.H., Reed M., Shoaf K.A., Østensen R.H., Sahoo S.K.
2021, Astronomy & Astrophysics, 651, 121
DOI: 10.1051/0004-6361/202140961
Baran A.S., Koen C.
2021, Acta Astronomica, 71, 113
DOI: 10.32023/0001-5237/71.2.3
Ostrowski J., Baran A.S., Sanjayan S., Sahoo S.K.
2021, Monthly Notices of the Royal Astronomical Society, 503, 4646
DOI: 10.1093/mnras/staa3751
Baran A.S., Østensen R.H., Heber U., Irrgang A., Sanjayan S., Telting J.H., Reed M.D., Ostrowski J.
2021, Monthly Notices of the Royal Astronomical Society, 503, 2157
DOI: 10.1093/mnras/stab620
Baran A.S., Sahoo S.K., Sanjayan S., Ostrowski J.
2021, Monthly Notices of the Royal Astronomical Society, 503, 3828
DOI: 10.1093/mnras/stab668
Córsico A.H., Uzundag M., Kepler S.O., Althaus L.G., Silvotti R., Baran A.S., Vučković M., Werner K., Bell K.J., Higgins M.
2021, Astronomy & Astrophysics, 645, 177
DOI: 10.1051/0004-6361/202039202
Baran A.S. & Silvotti R.
2020, Research Notes of the Astronomical American Society, 4, 237
DOI: 10.3847/2515-5172/abd31a
Østensen R.H., Jeffery C.S., Saio H., Hermes J.J., Telting J.H., Vuckovic M., Vos J., Baran A.S., Reed M.D.,
2020, Monthly Notices of the Royal Astronomical Society, 499, 3738
DOI: 10.1093/mnras/staa3123
Sahoo S.K., Baran A.S., Sanjayan S., Ostrowski J.
2020, Monthly Notices of the Royal Astronomical Society, 499, 5508
DOI: 10.1093/mnras/staa2991
Pelisoli I., Vos J., Geier S., Schaffenroth V., Baran A.S.
2020, Astronomy & Astrophysics, 642, 180
DOI: 10.1051/0004-6361/202038473
Sahoo S.K., Baran A.S., Heber U., Ostrowski J., Sanjayan S., Silvotti R., Irrgang A., Uzundag M., Reed M.D., Shoaf K.A., Raddi R., Vuckovic M., Ghasemi H., Zong W., Bell K.J.
2020, Monthly Notices of the Royal Astronomical Society, 495, 2844
DOI: 10.1093/mnras/staa1337
Bognár Zs., Kawaler S.D., Bell K.J., Schrandt C., Baran A.S., Bradley P.A., Hermes J.J., Charpinet S., Handler G., Mullally S.E., Murphy S.J., Raddi R., Sódor Á., Tremblay P.-E., Uzundag M., Zong W.
2020, Astronomy & Astrophysics, 638, 82
DOI: 10.1051/0004-6361/202037470
Reed M.D., Shoaf K.A., Németh P., Vos J., Uzundag M., Baran A.S., Sahoo S.K., Jeffery C.S., Telting J.H., Østensen R.H.
2020, Monthly Notices of the Royal Astronomical Society, 493, 5162
DOI: 10.1093/mnras/staa661
Althaus Leandro G., Córsico Alejandro H., Uzundag Murat, Vučković Maja, Baran Andrzej S., Bell Keaton J., Camisassa María E., Calcaferro Leila M., De Gerónimo Francisco C., Kepler Souza Oliveira and Silvotti Roberto
2020, Astronomy & Astrophysics, 633, 20
DOI: 10.1051/0004-6361/201936346
Reed M.D., Yeager M., Vos J., Telting J.H., Østensen R.H., Slayton A., Baran A.S. and Jeffery C.S
2020, Monthly Notices of the Royal Astronomical Society, 492, 5202
DOI: 10.1093/mnras/staa144
Charpinet S., Brassard P., Fontaine G., Van Grootel V., Zong W., Giammichele N., Heber U., Bognár Zs., Geier S., Green E.M., Hermes J.J., Kilkenny D., Østensen R.H., Pelisoli I., Silvotti R., Telting J.H., Vučković M., Worters H.L., Baran A.S., Bell K.J., Bradley P.A., Debes J.H., Kawaler S.D., Kołaczek-Szymański P., Murphy S.J., Pigulski A., Sódor À., Uzundag M., Handberg R., Kjeldsen H., Ricker G.R. and Vanderspek R.K.
2019, Astronomy & Astrophysics, 632, 90
DOI: 10.1051/0004-6361/201935395
Bell Keaton J., Córsico Alejandro H., Bischoff-Kim Agnès, Althaus Leandro G., Bradley Paul A., Calcaferro Leila M., Montgomery Michael H., Uzundag Murat, Baran Andrzej S., Bognár Zsófia, Charpinet Stéphane, Ghasemi Hamed and Hermes J.J.
2019, Astronomy & Astrophysics, 632, 42
DOI: 10.1051/0004-6361/201936340
Silvotti R., Uzundag M., Baran A.S., Østensen R.H., Telting J.H., Heber U., Reed M.D. and Vǔcković M.
2019, MNRAS, 489, 4791
DOI: 10.1093/mnras/stz2244
Baran A.S., Telting J.H., Jeffery C.S., Østensen R.H., Vos J., Reed M.D., Vŭcković M.
2019, MNRAS, 489, 1556
DOI: 10.1093/mnras/stz2209
Reed M.D., Telting J.H., Ketzer L., Crooke J.A., Baran A.S., Vos J., Németh P., Østensen R.H. and Jeffery C.S.
2019, MNRAS, 483, 2282
DOI: 10.1093/mnras/sty3025
Baran A.S., Østensen R.H., Telting J.H., Vos J., Kilkenny D., Vučković M., Reed M.D., Silvotti R., Jeffery, C.S., Parsons S.G., Dhillon V. and Marsch T.R.
2018, MNRAS, 481, 2721
DOI: 10.1093/mnras/sty2473
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