New binaries among UV-selected, hot subdwarf stars and population properties

Article


Kawka, A., Vennes, S., O'Toole, S., Nemeth, P., Burton, D., Kotze, E. and Buckle, D. A . H.. 2015. "New binaries among UV-selected, hot subdwarf stars and population properties." Monthly Notices of the Royal Astronomical Society. 450 (4), pp. 3514-3548. https://doi.org/10.1093/mnras/stv821
Article Title

New binaries among UV-selected, hot subdwarf stars and population properties

ERA Journal ID1074
Article CategoryArticle
AuthorsKawka, A. (Author), Vennes, S. (Author), O'Toole, S. (Author), Nemeth, P. (Author), Burton, D. (Author), Kotze, E. (Author) and Buckle, D. A . H. (Author)
Journal TitleMonthly Notices of the Royal Astronomical Society
Journal Citation450 (4), pp. 3514-3548
Number of Pages35
Year2015
PublisherOxford University Press
Place of PublicationUnited Kingdom
ISSN0035-8711
1365-2966
Digital Object Identifier (DOI)https://doi.org/10.1093/mnras/stv821
Web Address (URL)https://academic.oup.com/mnras/article/450/4/3514/991666
Abstract

We have measured the orbital parameters of seven close binaries, including six new objects, in a radial velocity survey of 38 objects comprising a hot subdwarf star with orbital periods ranging from ~0.17 to 3 d. One new system, GALEX J2205-3141, shows reflection on an M dwarf companion. Three other objects show significant short-period variations, but their orbital parameters could not be constrained. Two systems comprising a hot subdwarf paired with a bright main-sequence/giant companion display short-period photometric variations possibly due to irradiation or stellar activity and are also short-period candidates. All except two candidates were drawn from a selection of subluminous stars in the Galaxy Evolution Explorer ultraviolet sky survey. Our new identifications also include a low-mass subdwarf B star and likely progenitor of a low-mass white dwarf (GALEX J0805-1058) paired with an unseen, possibly substellar, companion. The mass functions of the newly identified binaries imply minimum secondary masses ranging from 0.03 to 0.39M⊙. Photometric time series suggest that, apart from GALEX J0805-1058 and J2205-3141, the companions are most likely white dwarfs. We update the binary population statistics: close to 40 per cent of hot subdwarfs have a companion. Also, we found that the secondary mass distribution shows a lowmass peak attributed to late-type dwarfs, and a higher mass peak and tail distribution attributed to white dwarfs and a few spectroscopic composites. Also, we found that the population kinematics imply an old age and include a few likely halo population members.

Keywordsbinaries: close; binaries: spectroscopic; subdwarfs; white dwarfs; ultraviolet: stars
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Is obsoleted byErratum: New binaries among UV-selected, hot subdwarf stars and population properties
ANZSRC Field of Research 2020510109. Stellar astronomy and planetary systems
Public Notes

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

Byline AffiliationsCzech Academy of Sciences, Czech Republic
Australian Astronomical Observatory, Australia
University of Erlangen–Nuremberg, Germany
School of Agricultural, Computational and Environmental Sciences
University of Cape Town, South Africa
South African Astronomical Observatory, South Africa
Institution of OriginUniversity of Southern Queensland
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Bond, J. C., Lauretta, D. S., Tinney, C. G., Butler, R. P., Marcy, G. W., Jones, H. R. A., Carter, B. D., O'Toole, S. J. and Bailey, J.. 2008. "Beyond the Iron Peak: r- and s-Process Elemental Abundances in Stars with Planets." The Astrophysical Journal: an international review of astronomy and astronomical physics. 682 (2), pp. 1234-1247. https://doi.org/10.1086/589236
The 2:1 resonant exoplanetary system orbiting HD 73526
Tinney, Chris G., Butler, R. Paul, Marcy, Geoffrey W., Jones, Hugh R. A., Laughlin, Gregory, Carter, Brad D., Bailey, Jeremy and O'Toole, Simon J.. 2006. "The 2:1 resonant exoplanetary system orbiting HD 73526." The Astrophysical Journal: an international review of astronomy and astronomical physics. 647 (1), pp. 594-599. https://doi.org/10.1086/503706
New planets around three G Dwarfs
O'Toole, Simon J., Butler, R. Paul, Tinney, Chris G., Jones, Hugh R. A., Marcy, Geoffrey W., Carter, Brad, McCarthy, Chris, Bailey, Jeremy, Penny, Alan J., Apps, Kevin and Fischer, Debra A.. 2007. "New planets around three G Dwarfs." The Astrophysical Journal: an international review of astronomy and astronomical physics. 660 (2), pp. 1636-1641. https://doi.org/10.1086/513563
The disk-bearing young star IM Lupi: X-ray properties and limits on accretion
Gunther, H. M., Matt, S. P., Schmitt, J. H. M. M., Gudel, M., Li, Z. Y. and Burton, D. M.. 2010. "The disk-bearing young star IM Lupi: X-ray properties and limits on accretion." Astronomy and Astrophysics: a European journal. 519 (10), p. A97. https://doi.org/10.1051/0004-6361/201014386
A super-Earth and two Neptunes orbiting the nearby Sun-like star 61 Virginis
Vogt, Steven S., Wittenmyer, Robert A., Butler, R. Paul, O'Toole, Simon, Henry, Gregory W., Rivera, Eugenio J., Meschiari, Stefano, Laughlin, Gregory, Tinney, C. G., Jones, Hugh R. A., Bailey, Jeremy, Carter, Brad D. and Batygin, Konstantin. 2010. "A super-Earth and two Neptunes orbiting the nearby Sun-like star 61 Virginis." The Astrophysical Journal: an international review of astronomy and astronomical physics. 708 (2), pp. 1366-1375. https://doi.org/10.1088/0004-637X/708/2/1366
NACO-SDI imaging of known companion host stars from the AAPS and Keck planet search surveys
Jenkins, J. S., Jones, H. R. A., Biller, B., O'Toole, S. J., Pinfield, D. J., Close, L., Tinney, C. G., Butler, R. P., Wittenmyer, R., Carter, B. and Day-Jones, A. C.. 2010. "NACO-SDI imaging of known companion host stars from the AAPS and Keck planet search surveys." Astronomy and Astrophysics: a European journal. 515 (2), pp. A17-28. https://doi.org/10.1051/0004-6361/200913737
The frequency of low-mass exoplanets. II. The 'period valley'
Wittenmyer, Robert A., O'Toole, Simon J., Jones, H. R. A., Tinney, C. G., Butler, R. P., Carter, B. D. and Bailey, J.. 2010. "The frequency of low-mass exoplanets. II. The 'period valley'." The Astrophysical Journal: an international review of astronomy and astronomical physics. 722 (2), pp. 1854-1863. https://doi.org/10.1088/0004-637X/722/2/1854
A long-period planet orbiting a nearby Sun-like star
Jones, Hugh R. A., Butler, R. Paul, Tinney, C. G., O'Toole, Simon, Wittenmyer, Rob, Henry, Gregory W., Meschiari, Stefano, Vogt, Steve, Rivera, Eugenio, Laughlin, Greg, Carter, Brad D., Bailey, Jeremy and Jenkins, James S.. 2010. "A long-period planet orbiting a nearby Sun-like star." Monthly Notices of the Royal Astronomical Society. 403 (4), pp. 1703-1713. https://doi.org/10.1111/j.1365-2966.2009.16232.x
Exoplanet properties from Lick, Keck and AAT
Marcy, G. W., Butler, R. P., Vogt, S. S., Fischer, D. A., Wright, J. T., Johnson, J. A., Tinney, C. G., Jones, H. R. A., Carter, B. D., Bailey, J., O'Toole, S. J. and Upadhyay, S.. 2008. "Exoplanet properties from Lick, Keck and AAT." Piskunov, Nikolai, Rickman, hans and Gustafsson, Bengt (ed.) Nobel Symposium 135: Physics of Planetary Systems. Stockholm, Sweden 18 - 22 Jun 2007 Bristol, United Kingdom. IOP Publishing. https://doi.org/10.1088/0031-8949/2008/T130/014001
A multi-site campaign to measure solar-like oscillations in Procyon. II. mode frequencies
Bedding, Timothy R., Kjeldsen, Hans, Campante, Tiago L., Appourchaux, Thierry, Bonanno, Alfio, Chaplin, William J., Garcia, Rafael A., Martić, Milena, Mosser, Benoit, Butler, R. Paul, Bruntt, Hans, Kiss, László L., O'Toole, Simon J., Kambe, Eiji, Ando, Hiroyasu, Izumiura, Hideyuki, Sato, Bun'ei, Hartmann, Michael, Hatzes, Artie, ..., Reffert, Sabine. 2010. "A multi-site campaign to measure solar-like oscillations in Procyon. II. mode frequencies." The Astrophysical Journal: an international review of astronomy and astronomical physics. 713 (2), pp. 935-949. https://doi.org/10.1088/0004-637X/713/2/935
The 6dF Galaxy Survey: Final redshift release (DR3) and southern large-scale structures
Heath Jones, D., Read, Mike A., Saunders, Will, Colless, Matthew, Jarrett, Tom, Parker, Quentin A., Fairall, Anthony P., Mauch, Thomas, Sadler, Elaine M., Watson, Fred G., Burton, Donna, Campbell, Lachlan A., Cass, Paul, Croom, Scott M., Dawe, John, Fiegert, Kristin, Frankcombe, Leela, Hartley, Malcolm, Huchra, John, ..., Williams, Mary. 2009. "The 6dF Galaxy Survey: Final redshift release (DR3) and southern large-scale structures." Monthly Notices of the Royal Astronomical Society. 399 (2), pp. 683-698. https://doi.org/10.1111/j.1365-2966.2009.15338.x
The radial velocity experiment (RAVE): second data release
Zwitter, T., Siebert, A., Munari, U., Freeman, K. C., Siviero, A., Watson, F. G., Fulbright, J. P., Wyse, R. F. G., Campbell, R., Seabroke, G. M., Williams, Mary., Steinmetz, M., Bienayme, O., Gilmore, G., Grebel, E. K., Helmi, A., Navarro, J. F., Anguiano, B., Boeche, C., ..., Wylie de Boer, E.. 2008. "The radial velocity experiment (RAVE): second data release." The Astronomical Journal. 136 (1), pp. 421-451. https://doi.org/10.1088/0004-6256/136/1/421
The radial velocity experiment (RAVE): first data release
Steinmetz, M., Zwitter, T., Siebert, A., Watson, F. G., Freeman, K. C., Munari, U., Campbell, R., Williams, M., Seabroke, G. M., Wyse, R. F. G., Parker, Q. A., Bienayme, O., Roeser, S., Gibson, B. K., Gilmore, G., Grebel, E. K., Helmi, A., Navarro, J. F., Burton, D., ..., Schilbach, E.. 2006. "The radial velocity experiment (RAVE): first data release." The Astronomical Journal. 132 (4), pp. 1645-1668. https://doi.org/10.1086/506564