KIC 10449976: discovery of an extreme helium subdwarf in the Kepler field

Jeffery, C. S.; Ramsay, Gavin; Naslim, N; Carrera, R.; Greiss, S.; Barclay, Thomas; Karjalainen, R.; Brooks, Adam C.; Hakala, Pasi

doi:10.1093/mnras/sts579

Cited by 17 publications

(18 citation statements)

References 32 publications

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“…In a recent paper (Jeffery et al 2013) report a 3.9 day periodic photometric variation in the hot subdwarf star KIC 10449976. The period is not stable, neither in time nor in amplitude.…”

Section: Discussionmentioning

confidence: 98%

“…Such fluctuation amplitudes can explain the periodic modulation of P = 3.9 day with an amplitude of ∼ 0.02% (Jeffery et al 2013).…”

Section: Physical Properties Of the Proposed Kic 10449976 Planetmentioning

confidence: 88%

“…The period is not stable, neither in time nor in amplitude. Jeffery et al (2013) discuss three possible scenarios as possible explanations: stelar spots, pulsation, and their favorable explanation of reflection from a "stellar" companion. However, they do not account for the unstable periodic behavior.…”

Section: Discussionmentioning

confidence: 99%

“…The effective temperature and surface gravity of KIC 10449976 are T eff = 40000 ± 300K and log g( cm s −2 ) = 5.3 ± 0.1, respectively (Jeffery et al 2013). Therefore the radius and luminosity of KIC 10449976 are…”

Section: Physical Properties Of the Proposed Kic 10449976 Planetmentioning

confidence: 95%

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Planetary influences on photometric variations of the extreme helium subdwarf KIC 10449976

Bear

Soker

2013

Monthly Notices of the Royal Astronomical Society

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We propose that the unstable 3.9 day photometric periodicity of the hot subdwarf (sdO) KIC 10449976 results from a tidally locked planet that is heated to ∼ 5000 K by the UV radiation from the hot sdO star. Although the bolometric radiation from the planet is very small relative to that of the star, in the visible band the planet contributes ∼ 0.07% of the light, sufficient to explain the observed periodic behavior. In our proposed scenario the stochastic variations in period and light amplitude are attributed to weather on the planet. Namely, streams on the surface and thermal variations in the planet's atmosphere that are driven by the heating and by the planet rotation lead to stochastic changes in the amount of radiation emitted by the planets. We predict that a careful monitoring will reveal a gas giant planet at an orbital separation of 8.3R ⊙ from KIC 10449976.

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“…In a recent paper (Jeffery et al 2013) report a 3.9 day periodic photometric variation in the hot subdwarf star KIC 10449976. The period is not stable, neither in time nor in amplitude.…”

Section: Discussionmentioning

confidence: 98%

“…Such fluctuation amplitudes can explain the periodic modulation of P = 3.9 day with an amplitude of ∼ 0.02% (Jeffery et al 2013).…”

Section: Physical Properties Of the Proposed Kic 10449976 Planetmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Section: Physical Properties Of the Proposed Kic 10449976 Planetmentioning

confidence: 95%

See 2 more Smart Citations

Planetary influences on photometric variations of the extreme helium subdwarf KIC 10449976

Bear

Soker

2013

Monthly Notices of the Royal Astronomical Society

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“…As part of our follow up programme, we obtained lowmedium resolution optical spectroscopy of over 50 sources which were either identified as being variable on a short timescale or had unusual colours. (One very blue source in our sample, KIC 10449976, has already been reported as an extreme helium star, Jeffery et al 2013). We obtained data using the Intermediate Dispersion Spectrograph (IDS) and the R400 grism on the INT between 26-28 June 2012 and also using the Optical System for Imaging and Low Resolution Integrated Spectroscopy (OSIRIS) tunable imager and spectrograph and the R1000R grism on the 10.4 m GTC during March -June 2013.…”

Section: Optical Spectroscopymentioning

confidence: 99%

RATS-Kepler – a deep high-cadence survey of the Kepler field

Ramsay¹,

Brooks²,

Hakala³

et al. 2013

Monthly Notices of the Royal Astronomical Society

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We outline the purpose, strategy and first results of a deep, high cadence, photometric survey of the Kepler field using the Isaac Newton Telescope on La Palma and the MDM 1.3m Telescope on Kitt Peak. Our goal was to identify sources located in the Kepler field of view which are variable on a timescale of a few mins to 1 hour. The astrophysically most interesting sources would then have been candidates for observation using Kepler using 1 min sampling. Our survey covered ∼42% of the Kepler field of view and we have obtained light curves for 7.1×10 5 objects in the range 13< g < 20.We have discovered more than 100 variable sources which have passed our two stage identification process. As a service to the wider community, we make our data products and cleaned CCD images available to download. We obtained Kepler data of 18 sources which we found to be variable using our survey and we give an overview of the currently available data here. These sources include a pulsating DA white dwarf, eleven δ Sct stars which have dominant pulsation periods in the range 24 min to 2.35 hrs, three contact binaries, and a cataclysmic variable (V363 Lyr). One of the δ Sct stars is in a contact binary.

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2015

Pulsating Stars

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KIC 10449976: discovery of an extreme helium subdwarf in the Kepler field

Cited by 17 publications

References 32 publications

Planetary influences on photometric variations of the extreme helium subdwarf KIC 10449976

Planetary influences on photometric variations of the extreme helium subdwarf KIC 10449976

RATS-Kepler – a deep high-cadence survey of the Kepler field

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