The DECam minute cadence survey – II. 49 variables but no planetary transits of a white dwarf
| Autor: | Mukremin Kilic, Alexandros Gianninas, Armin Rest, Claudia Belardi, Kyra Dame, Warren R. Brown, S. D. Barber |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
010308 nuclear & particles physics FOS: Physical sciences White dwarf Astronomy Astronomy and Astrophysics RR Lyrae variable 01 natural sciences Photometry (optics) Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Planet 0103 physical sciences Cadence 010303 astronomy & astrophysics Circumstellar habitable zone Solar and Stellar Astrophysics (astro-ph.SR) |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 490:1066-1075 |
| ISSN: | 1365-2966 0035-8711 |
| Popis: | We present minute cadence photometry of 31732 point sources observed in one 3 $deg^{2}$ DECam pointing centred at RA = 09:03:02 and Dec = -04:35:00 over eight consecutive half-nights. We use these data to search for eclipse-like events consistent with a planetary transit of a white dwarf and other sources of stellar variability within the field. We do not find any significant evidence for minute-long transits around our targets, hence we rule out planetary transits around ~370 white dwarfs that should be present in this field. Additionally, we identify 49 variables, including 40 new systems. These include 23 detached or contact stellar binaries, 1 eclipsing white dwarf + M dwarf binary, 16 $\delta$ Scuti, three RR Lyrae, and two ZZ Ceti pulsators. Results from the remaining two fields in our survey will allow us to place more stringent constraints on the frequency of planets orbiting white dwarfs in the habitable zone. Comment: 11 pages, 14 figures, 1 table. Accepted for publication in Monthly Notices of the Royal Astronomical Society Main Journal |
| Databáze: | OpenAIRE |
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