Kepler detection of a new extreme planetary system orbiting the subdwarf-B pulsator KIC10001893

Abstract

KIC10001893 is one out of 19 subdwarf-B (sdB) pulsators observed by the Kepler spacecraft in its primary mission. In addition to tens of pulsation frequencies in the g-mode domain, its Fourier spectrum shows three weak peaks at very low frequencies, which is too low to be explained in terms of g modes. The most convincing explanation is that we are seeing the orbital modulation of three Earth-size planets (or planetary remnants) in very tight orbits, which are illuminated by the strong stellar radiation. The orbital periods are P1=5.273, P2=7.807, and P3=19.48 hours, and the period ratios P2/P1=1.481 and P3/P2=2.495 are very close to the 3:2 and 5:2 resonances, respectively. One of the main pulsation modes of the star at 210.68 μHz corresponds to the third harmonic of the orbital frequency of the inner planet, suggesting that we see, for the first time in an sdB star, g-mode pulsations tidally excited by a planetary companion. The extreme planetary system that emerges from the Kepler data is very similar to the recent discovery of two Earth-size planets orbiting the sdB pulsator KIC05807616 (Charpinet et al. 2011a).

arXiv comment6 pages, 5 figures, accepted for publication in Astronomy and Astrophysics

References in corpus (35)

• The Origin of Subdwarf B Star (I): the Formation Channels
• The origin of sdB stars (II)
• Kepler Asteroseismology Program: Introduction and First Results
• Kepler-36: A Pair of Planets with Neighboring Orbits and Dissimilar Densities
• The Orbital Evolution of Gas Giant Planets around Giant Stars
• Foretellings of Ragnarök: World-engulfing Asymptotic Giants and the Inheritance of White Dwarfs
• Composition and fate of short-period super-Earths: The case of CoRoT-7b
• The sdB+M Eclipsing System HW Virginis and its Circumbinary Planets
• Hot Jupiters and Cool Stars
• Can Planets survive Stellar Evolution?
• Can Planets Influence the Horizontal Branch Morphology?
• On the Orbits of Low-mass Companions to White Dwarfs and the Fates of the Known Exoplanets
• KIC 4544587: an Eccentric, Short Period Binary System with delta Sct Pulsations and Tidally Excited Modes
• First Kepler results on compact pulsators I. Survey target selection and the first pulsators
• FM stars: A Fourier view of pulsating binary stars, a new technique for measuring radial velocities photometrically
• Tides and Tidal Engulfment in Post-Main Sequence Binaries: Period Gaps for Planets and Brown Dwarfs Around White Dwarfs
• Circumbinary Planets Orbiting the Rapidly Pulsating Subdwarf B-type binary NY Vir
• The quest for companions to post-common envelope binaries: III. A reexamination of HW Virginis
• The quest for companions to post-common envelope binaries. II. NSVS14256825 and HS0705+6700
• First Kepler results on compact pulsators VI. Targets in the final half of the survey phase
• First Kepler results on compact pulsators VIII: Mode identifications via period spacings in $g-$mode pulsating Subdwarf B stars
• A pulsation zoo in the hot subdwarf B star KIC 10139564 observed by Kepler
• Three ways to solve the orbit of KIC11558725: a 10 day beaming sdB+WD binary with a pulsating subdwarf
• Binaries discovered by the MUCHFUSS project SDSS J08205+0008 - An eclipsing subdwarf B binary with brown dwarf companion
• Hot subdwarf stars in close-up view - II. Rotational properties of single and wide binary subdwarf B stars
• Detection of a tertiary brown dwarf companion in the sdB-type eclipsing binary HS 0705+6700
• Binaries discovered by the MUCHFUSS project: SDSS J162256.66$+$473051.1 - An eclipsing subdwarf B binary with a brown dwarf companion
• A tidally destructed massive planet as the progenitor of the two light planets around the sdB star KIC 05807616
• On the survival of brown dwarfs and planets engulfed by their giant host star
• First Kepler results on compact pulsators III: Subdwarf B stars with V1093~Her and hybrid (DW~Lyn) type pulsations
• First Kepler results on compact pulsators V: Slowly pulsating subdwarf B stars in short-period binaries
• KIC 1718290: A Helium-rich V1093-Her-like Pulsator on the Blue Horizontal Branch
• First Kepler results on compact pulsators II: KIC 010139564, a new pulsating subdwarf B (V361 Hya) star with an additional low-frequency mode
• First Kepler results on compact pulsators VII. Pulsating subdwarf B stars detected in the second half of the survey phase
• Binary Evolution Leads to Two Populations of White Dwarf Companions

Cited by in corpus (26)

• Hot subluminous stars
• Revised Stellar Properties of Kepler Targets for the Q1-17 (DR25) Transit Detection Run
• Hydrodynamic Simulations of the Interaction between Giant Stars and Planets
• KELT-20b: A giant planet with a period of P~ 3.5 days transiting the V~ 7.6 early A star HD 185603
• Studying atmosphere-dominated hot Jupiter Kepler phase curves: Evidence that inhomogeneous atmospheric reflection is common
• Planetary systems and real planetary nebulae from planet destruction near white dwarfs
• Identifying close binary central stars of PN with Kepler
• Companions to APOGEE Stars I: A Milky Way-Spanning Catalog of Stellar and Substellar Companion Candidates and their Diverse Hosts
• Discovery of a variable lead-rich hot subdwarf: UVO 0825+15
• Exoplanet recycling in massive white-dwarf debris discs
• A planet in an 840-d orbit around a Kepler main-sequence A star found from phase modulation of its pulsations
• A transit survey to search for planets around hot subdwarfs: I. methods and performance tests on light curves from Kepler, K2, TESS, and CHEOPS
• A Search for short-period Rocky Planets around WDs with the Cosmic Origins Spectrograph (COS)
• ALMA observations of the nearby AGB star L${}_2$ Puppis. II. Gas disk properties derived from ${}^{12}$CO and ${}^{13}$CO $J=$3$-$2 emission
• Filling the gap between synchronized and non-synchronized sdBs in short-period sdBV+dM binaries with TESS: TIC 137608661, a new system with a well defined rotational splitting
• The sdB pulsating star V391 Peg and its putative giant planet revisited after 13 years of time-series photometric data
• KIC 10001893: A pulsating sdB star with multiple trapped modes
• Binary star detectability in $Kepler$ data from phase modulation of different types of oscillations
• EPIC 216747137: a new HW Vir eclipsing binary with a massive sdOB primary and a low-mass M-dwarf companion
• An Empirical Bayesian Approach to Limb-darkening in Modeling WASP-121b Transit Light Curves
• Analysis of putative exoplanetary signatures found in light curves of two sdBV stars observed by Kepler
• Hot subdwarfs - Small stars marking important events in stellar evolution
• The quest for planets around subdwarfs and white dwarfs from Kepler space telescope fields: Part I. Techniques and tests of the methods
• The EXOTIME project: Signals in the $O-C$ diagrams of the rapidly pulsating subdwarfs DW Lyn, V1636 Ori, QQ Vir, and V541 Hya
• Pulsation in TESS Objects of Interest
• Discerning internal conditions of pulsating hot subdwarf B stars. Modelling multiple trapped modes in KIC 10001893