THE K2-ESPRINT PROJECT IV. A HOT JUPITER IN A PROGRADE ORBIT WITH A POSSIBLE STELLAR COMPANION

We report on the detection and early characterization of a hot Jupiter in a three day orbit around K2-34 (EPIC 212110888), a metal-rich F-type star located in the K2 Cycle 5 field. Our follow-up campaign involves precise radial velocity (RV) measurements and high-contrast imaging using multiple facilities. The absence of a bright nearby source in our high-contrast data suggests that the transit-like signals are not due to light variations from such a companion star. Our intensive RV measurements show that K2-34b (EPIC 212110888b) has a mass of , confirming its status as a planet. We also detect the Rossiter–McLaughlin effect for K2-34b and show that the system has a good spin–orbit alignment ( degrees). High-contrast images obtained by the HiCIAO camera on the Subaru 8.2 m telescope reveal a faint companion candidate (CC) ( mag) at a separation of . Follow-up observations are needed to confirm that the CC is physically associated with K2-34. K2-34b appears to be an example of a typical “hot Jupiter,” albeit one which can be precisely characterized using a combination of K2 photometry and ground-based follow-up.

[1]  D. F. Gray,et al.  The Observation and Analysis of Stellar Photospheres , 2021 .

[2]  G. Nowak,et al.  THE K2-ESPRINT PROJECT. II. SPECTROSCOPIC FOLLOW-UP OF THREE EXOPLANET SYSTEMS FROM CAMPAIGN 1 OF K2 , 2016, 1602.01851.

[3]  David J Armstrong,et al.  K2-30 b and K2-34 b: Two inflated hot Jupiters around solar-type stars , 2016, Astronomy & Astrophysics.

[4]  M. Tamura,et al.  THE K2-ESPRINT PROJECT III: A CLOSE-IN SUPER-EARTH AROUND A METAL-RICH MID-M DWARF , 2015, 1511.08508.

[5]  Jason T. Wright,et al.  A disintegrating minor planet transiting a white dwarf , 2015, Nature.

[6]  K. Batygin,et al.  MAGNETIC ORIGINS OF THE STELLAR MASS-OBLIQUITY CORRELATION IN PLANETARY SYSTEMS , 2015, 1508.02365.

[7]  F. Adams,et al.  WASP-47: A HOT JUPITER SYSTEM WITH TWO ADDITIONAL PLANETS DISCOVERED BY K2 , 2015, 1508.02411.

[8]  Howard Isaacson,et al.  TWO TRANSITING EARTH-SIZE PLANETS NEAR RESONANCE ORBITING A NEARBY COOL STAR , 2015, 1507.08256.

[9]  M. Paegert,et al.  THE K2-ESPRINT PROJECT. I. DISCOVERY OF THE DISINTEGRATING ROCKY PLANET K2-22b WITH A COMETARY HEAD AND LEADING TAIL , 2015, 1504.04379.

[10]  T. Hirano,et al.  PRECISE RADIAL VELOCITY MEASUREMENTS FOR KEPLER GIANTS HOSTING PLANETARY CANDIDATES: KEPLER-91 AND KOI-1894 , 2015, 1501.05415.

[11]  B. J. Fulton,et al.  A NEARBY M STAR WITH THREE TRANSITING SUPER-EARTHS DISCOVERED BY K2 , 2015, 1501.03798.

[12]  Eric B. Bechter,et al.  FRIENDS OF HOT JUPITERS. II. NO CORRESPONDENCE BETWEEN HOT-JUPITER SPIN–ORBIT MISALIGNMENT AND THE INCIDENCE OF DIRECTLY IMAGED STELLAR COMPANIONS , 2014, 1501.00013.

[13]  T. Hirano,et al.  GLOBAL ANALYSIS OF KOI-977: SPECTROSCOPY, ASTEROSEISMOLOGY, AND PHASE-CURVE ANALYSIS , 2014, 1411.1130.

[14]  T. Hirano,et al.  TIDAL EVOLUTION OF THE SPIN–ORBIT ANGLE IN EXOPLANETARY SYSTEMS , 2014, 1401.5876.

[15]  S. Hinkley,et al.  FRIENDS OF HOT JUPITERS. I. A RADIAL VELOCITY SEARCH FOR MASSIVE, LONG-PERIOD COMPANIONS TO CLOSE-IN GAS GIANT PLANETS , 2013, 1312.2954.

[16]  A. Ofir.  Optimizing the search for transiting planets in long time series , 2013, 1307.7330.

[17]  Nicolas Buchschacher,et al.  Harps-N: the new planet hunter at TNG , 2012, Other Conferences.

[18]  C. A. Grady,et al.  NEW TECHNIQUES FOR HIGH-CONTRAST IMAGING WITH ADI: THE ACORNS-ADI SEEDS DATA REDUCTION PIPELINE , 2012, 1209.3014.

[19]  W. M. Wood-Vasey,et al.  THE NINTH DATA RELEASE OF THE SLOAN DIGITAL SKY SURVEY: FIRST SPECTROSCOPIC DATA FROM THE SDSS-III BARYON OSCILLATION SPECTROSCOPIC SURVEY , 2012, 1207.7137.

[20]  R. P. Butler,et al.  OBLIQUITIES OF HOT JUPITER HOST STARS: EVIDENCE FOR TIDAL INTERACTIONS AND PRIMORDIAL MISALIGNMENTS , 2012, 1206.6105.

[21]  J. Winn,et al.  MEASUREMENTS OF STELLAR INCLINATIONS FOR KEPLER PLANET CANDIDATES , 2012, 1401.1229.

[22]  E. Ford,et al.  Kepler constraints on planets near hot Jupiters , 2012, Proceedings of the National Academy of Sciences.

[23]  Tomoyasu Yamamuro,et al.  Image Slicer for the Subaru Telescope High Dispersion Spectrograph , 2012, 1203.5568.

[24]  Z. Csubry,et al.  HAT-P-38b : A Saturn-Mass Planet Transiting a Late G Star , 2012, 1201.5075.

[25]  S. Ida,et al.  ORBITAL DISTRIBUTIONS OF CLOSE-IN PLANETS AND DISTANT PLANETS FORMED BY SCATTERING AND DYNAMICAL TIDES , 2011 .

[26]  J. Winn,et al.  IMPROVED MODELING OF THE ROSSITER–McLAUGHLIN EFFECT FOR TRANSITING EXOPLANETS , 2011, 1108.4430.

[27]  S. Bloemen,et al.  Gravity and limb-darkening coefficients for the Kepler, CoRoT, Spitzer, uvby, UBVRIJHK, and Sloan photometric systems , 2011 .

[28]  Avi Shporer,et al.  THE IMPACT OF THE CONVECTIVE BLUESHIFT EFFECT ON SPECTROSCOPIC PLANETARY TRANSITS , 2011, 1103.0775.

[29]  R. Rebolo,et al.  High-contrast optical imaging of companions: the case of the brown dwarf binary HD 130948BC , 2010, 1009.5670.

[30]  Olivier Guyon,et al.  Commissioning status of Subaru laser guide star adaptive optics system , 2010, Astronomical Telescopes + Instrumentation.

[31]  Shane Jacobson,et al.  Performance characterization of the HiCIAO instrument for the Subaru Telescope , 2010, Astronomical Telescopes + Instrumentation.

[32]  John Asher Johnson,et al.  HOT STARS WITH HOT JUPITERS HAVE HIGH OBLIQUITIES , 2010, 1006.4161.

[33]  B. Smalley,et al.  Accurate fundamental parameters for 23 bright solar-type stars , 2010, 1002.4268.

[34]  M. R. Haas,et al.  OVERVIEW OF THE KEPLER SCIENCE PROCESSING PIPELINE , 2010, 1001.0258.

[35]  Isabelle Baraffe,et al.  Giant Planet Interior Structure and Thermal Evolution , 2009, 0911.3154.

[36]  A. Gimenez,et al.  Accurate masses and radii of normal stars: modern results and applications , 2009, 0908.2624.

[37]  Rafael Rebolo,et al.  FastCam: a new lucky imaging instrument for medium-sized telescopes , 2008, Astronomical Telescopes + Instrumentation.

[38]  Darko Jevremovic,et al.  The Dartmouth Stellar Evolution Database , 2008, 0804.4473.

[39]  Yasuhiro Ohta,et al.  PREDICTING PHOTOMETRIC AND SPECTROSCOPIC SIGNATURES OF RINGS AROUND TRANSITING EXTRASOLAR PLANETS , 2006, astro-ph/0611466.

[40]  M. Skrutskie,et al.  The Two Micron All Sky Survey (2MASS) , 2006 .

[41]  Cambridge,et al.  Lucky imaging: High angular resolution imaging in the visible from the ground , 2005, astro-ph/0507299.

[42]  J. Valenti,et al.  Spectroscopic Properties of Cool Stars (SPOCS). I. 1040 F, G, and K Dwarfs from Keck, Lick, and AAT Planet Search Programs , 2005 .

[43]  B. Sato,et al.  Spectroscopic Study on the Atmospheric Parameters of Nearby F-K Dwarfs and Subgiants , 2005 .

[44]  Yasuhiro Ohta,et al.  The Rossiter-McLaughlin Effect and Analytic Radial Velocity Curves for Transiting Extrasolar Planetary Systems , 2004, astro-ph/0410499.

[45]  Hideyuki Izumiura,et al.  Development of Iodine Cells for the Subaru HDS and the Okayama HIDES : II. New Software for Precise Radial Velocity Measurements , 2002 .

[46]  K. Sadakane,et al.  Spectroscopic Determination of Atmospheric Parameters of Solar-Type Stars: Description of the Method and Application to the Sun , 2002 .

[47]  G. Kov'acs,et al.  A box-fitting algorithm in the search for periodic transits , 2002, astro-ph/0206099.

[48]  D. Queloz,et al.  The CORALIE survey for southern extra-solar planets VII - Two short-period Saturnian companions to HD 108147 and HD 168746 , 2002, astro-ph/0202457.

[49]  C. Ree,et al.  Toward Better Age Estimates for Stellar Populations: The Y2 Isochrones for Solar Mixture , 2001, astro-ph/0104292.

[50]  Michael Frankfurter,et al.  Numerical Recipes In C The Art Of Scientific Computing , 2016 .

[51]  R. P. Butler,et al.  Measurement of Spin-Orbit Alignment in an Extrasolar Planetary System , 2005, astro-ph/0504555.

[52]  S. Tremaine,et al.  Submitted to ApJ Preprint typeset using L ATEX style emulateapj v. 10/09/06 SHRINKING BINARY AND PLANETARY ORBITS BY KOZAI CYCLES WITH TIDAL FRICTION , 2022 .