Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 470, Issue 4, Pages 4473-4492Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stx1522
Keywords
binaries: eclipsing; stars: fundamental parameters; stars: interiors; white dwarfs
Categories
Funding
- Leverhulme Trust
- European Research Council under the European Union's Seventh Framework Programme [340040, 320964]
- Science and Technology Facilities Council (STFC)
- Joint Committee ESO-Government of Chile [2014]
- MINECO [AYA2014-59084-P]
- NASA [HST-HF2-51357.001-A]
- FONDECYT [1141269]
- Millennium Science Initiative, Chilean ministry of Economy [P10-022-F]
- Science and Technology Facilities Council [ST/P000495/1, ST/M001350/1, ST/L000733/1, ST/M002012/1, ST/M006492/1] Funding Source: researchfish
- STFC [ST/P000495/1, ST/M001350/1, ST/L000733/1, ST/M002012/1, ST/F012276/1, ST/M006492/1, ST/L00061X/1, ST/P00721X/1, ST/H008500/1, ST/J001465/1, ST/K002783/1] Funding Source: UKRI
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We present high-precision, model-independent, mass and radius measurements for 16 white dwarfs in detached eclipsing binaries and combine these with previously published data to test the theoretical white dwarf mass-radius relationship. We reach a mean precision of 2.4 per cent in mass and 2.7 per cent in radius, with our best measurements reaching a precision of 0.3 per cent in mass and 0.5 per cent in radius. We find excellent agreement between the measured and predicted radii across a wide range of masses and temperatures. We also find the radii of all white dwarfs with masses less than 0.48 M-circle dot to be fully consistent with helium core models, but they are on average 9 per cent larger than those of carbon-oxygen core models. In contrast, white dwarfs with masses larger than 0.52 M-circle dot all have radii consistent with carbon-oxygen core models. Moreover, we find that all but one of the white dwarfs in our sample have radii consistent with possessing thick surface hydrogen envelopes (10(-5) >= M-H/M-WD >= 10(-4)), implying that the surface hydrogen layers of these white dwarfs are not obviously affected by common envelope evolution.
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