The closest extremely low-mass white dwarf to the Sun
We present the orbit and properties of 2MASS J050051.85-093054.9, establishing it as the closest (d ~ 71 pc) extremely low mass white dwarf to the Sun. We find that this star is hydrogen-rich with Teff ~ 10 500 K, log g ~ 5.9, and, following evolutionary models, has a mass of ~ 0.17 solar masses....
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
| Language: | English |
| Published: |
OXFORD UNIV PRESS
2020
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1093/mnrasl/slaa068 http://hdl.handle.net/20.500.11937/80039 |
| _version_ | 1848764146093391872 |
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| author | Kawka, Adela Simpson, Jeffrey D Vennes, Stephane Bessell, Michael S Da Costa, Gary S Marino, Anna F Murphy, Simon J |
| author_facet | Kawka, Adela Simpson, Jeffrey D Vennes, Stephane Bessell, Michael S Da Costa, Gary S Marino, Anna F Murphy, Simon J |
| author_sort | Kawka, Adela |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We present the orbit and properties of 2MASS J050051.85-093054.9,
establishing it as the closest (d ~ 71 pc) extremely low mass white dwarf to
the Sun. We find that this star is hydrogen-rich with Teff ~ 10 500 K, log g ~
5.9, and, following evolutionary models, has a mass of ~ 0.17 solar masses.
Independent analysis of radial velocity and TESS photometric time series
reveals an orbital period of ~ 9.5 h. Its high velocity amplitude (K ~ 144
km/s) produces a measurable Doppler beaming effect in the TESS light curve with
an amplitude of 1 mmag. The unseen companion is most likely a faint white
dwarf. J0500-0930 belongs to a class of post-common envelope systems that will
most likely merge through unstable mass transfer and in specific circumstances
lead to Type Ia supernova explosions. |
| first_indexed | 2025-11-14T11:14:43Z |
| format | Journal Article |
| id | curtin-20.500.11937-80039 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:14:43Z |
| publishDate | 2020 |
| publisher | OXFORD UNIV PRESS |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-800392020-08-17T06:09:48Z The closest extremely low-mass white dwarf to the Sun Kawka, Adela Simpson, Jeffrey D Vennes, Stephane Bessell, Michael S Da Costa, Gary S Marino, Anna F Murphy, Simon J Science & Technology Physical Sciences Astronomy & Astrophysics binaries: close stars: individual: 2MASS J050051.85-093054.9 white dwarfs SPECTRAL-ANALYSIS KEPLER We present the orbit and properties of 2MASS J050051.85-093054.9, establishing it as the closest (d ~ 71 pc) extremely low mass white dwarf to the Sun. We find that this star is hydrogen-rich with Teff ~ 10 500 K, log g ~ 5.9, and, following evolutionary models, has a mass of ~ 0.17 solar masses. Independent analysis of radial velocity and TESS photometric time series reveals an orbital period of ~ 9.5 h. Its high velocity amplitude (K ~ 144 km/s) produces a measurable Doppler beaming effect in the TESS light curve with an amplitude of 1 mmag. The unseen companion is most likely a faint white dwarf. J0500-0930 belongs to a class of post-common envelope systems that will most likely merge through unstable mass transfer and in specific circumstances lead to Type Ia supernova explosions. 2020 Journal Article http://hdl.handle.net/20.500.11937/80039 10.1093/mnrasl/slaa068 English http://dx.doi.org/10.1093/mnrasl/slaa068 http://purl.org/au-research/grants/arc/DP180101791 http://purl.org/au-research/grants/arc/DP150103294 OXFORD UNIV PRESS fulltext |
| spellingShingle | Science & Technology Physical Sciences Astronomy & Astrophysics binaries: close stars: individual: 2MASS J050051.85-093054.9 white dwarfs SPECTRAL-ANALYSIS KEPLER Kawka, Adela Simpson, Jeffrey D Vennes, Stephane Bessell, Michael S Da Costa, Gary S Marino, Anna F Murphy, Simon J The closest extremely low-mass white dwarf to the Sun |
| title | The closest extremely low-mass white dwarf to the Sun |
| title_full | The closest extremely low-mass white dwarf to the Sun |
| title_fullStr | The closest extremely low-mass white dwarf to the Sun |
| title_full_unstemmed | The closest extremely low-mass white dwarf to the Sun |
| title_short | The closest extremely low-mass white dwarf to the Sun |
| title_sort | closest extremely low-mass white dwarf to the sun |
| topic | Science & Technology Physical Sciences Astronomy & Astrophysics binaries: close stars: individual: 2MASS J050051.85-093054.9 white dwarfs SPECTRAL-ANALYSIS KEPLER |
| url | http://dx.doi.org/10.1093/mnrasl/slaa068 http://dx.doi.org/10.1093/mnrasl/slaa068 http://dx.doi.org/10.1093/mnrasl/slaa068 http://hdl.handle.net/20.500.11937/80039 |