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White dwarf rotation as a function of mass and a dichotomy of mode line widths : Kepler observations of 27 pulsating DA White Dwarfs through K2 campaign 8
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Hermes, J. J., Gaensicke, B. T. (Boris T.), Kawaler, Steven D., Greiss, Sandra, Tremblay, Pier-Emmanuel, Gentile Fusillo, N. P., Raddi, R., Fanale, S. M., Bell, Keaton J., Dennihy, E., Fuchs, J. T., Dunlap, B. H., Clemens, J. C., Montgomery, M. H., Winget, D. E., Chote, Paul, Marsh, Tom and Redfield, S. (2017) White dwarf rotation as a function of mass and a dichotomy of mode line widths : Kepler observations of 27 pulsating DA White Dwarfs through K2 campaign 8. The Astrophysical Journal Supplement Series, 232 (2). 23. doi:10.3847/1538-4365/aa8bb5 ISSN 0067-0049.
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Official URL: http://dx.doi.org/10.3847/1538-4365/aa8bb5
Abstract
We present photometry and spectroscopy for 27 pulsating hydrogen-atmosphere white dwarfs (DAVs; a.k.a. ZZ Ceti stars) observed by the Kepler space telescope up to K2 Campaign 8, an extensive compilation of observations with unprecedented duration (>75 days) and duty cycle (>90%). The space-based photometry reveals pulsation properties previously inaccessible to ground-based observations. We observe a sharp dichotomy in oscillation mode line widths at roughly 800 s, such that white dwarf pulsations with periods exceeding 800 s have substantially broader mode line widths, more reminiscent of a damped harmonic oscillator than a heat-driven pulsator. Extended Kepler coverage also permits extensive mode identification: we identify the spherical degree of 87 out of 201 unique radial orders, providing direct constraints of the rotation period for 20 of these 27 DAVs, more than doubling the number of white dwarfs with rotation periods determined via asteroseismology. We also obtain spectroscopy from 4 m-class telescopes for all DAVs with Kepler photometry. Using these homogeneously analyzed spectra, we estimate the overall mass of all 27 DAVs, which allows us to measure white dwarf rotation as a function of mass, constraining the endpoints of angular momentum in low- and intermediate-mass stars. We find that 0.51–0.73 M ⊙ white dwarfs, which evolved from 1.7–3.0 M ⊙ ZAMS progenitors, have a mean rotation period of 35 hr with a standard deviation of 28 hr, with notable exceptions for higher-mass white dwarfs. Finally, we announce an online repository for our Kepler data and follow-up spectroscopy, which we collect at http://k2wd.org.
Item Type: | Journal Article | ||||||||||||||||||||||||||||||
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Subjects: | Q Science > QB Astronomy | ||||||||||||||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | White dwarf stars, Stellar oscillations | ||||||||||||||||||||||||||||||
Journal or Publication Title: | The Astrophysical Journal Supplement Series | ||||||||||||||||||||||||||||||
Publisher: | Institute of Physics Publishing, Inc. | ||||||||||||||||||||||||||||||
ISSN: | 0067-0049 | ||||||||||||||||||||||||||||||
Official Date: | 9 October 2017 | ||||||||||||||||||||||||||||||
Dates: |
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Volume: | 232 | ||||||||||||||||||||||||||||||
Number: | 2 | ||||||||||||||||||||||||||||||
Article Number: | 23 | ||||||||||||||||||||||||||||||
DOI: | 10.3847/1538-4365/aa8bb5 | ||||||||||||||||||||||||||||||
Status: | Peer Reviewed | ||||||||||||||||||||||||||||||
Publication Status: | Published | ||||||||||||||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||||||||||||||
Copyright Holders: | © 2017. The American Astronomical Society. All rights reserved | ||||||||||||||||||||||||||||||
Date of first compliant deposit: | 18 January 2019 | ||||||||||||||||||||||||||||||
Date of first compliant Open Access: | 22 January 2019 | ||||||||||||||||||||||||||||||
RIOXX Funder/Project Grant: |
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