HAT-P-68b: A Transiting Hot Jupiter around a K5 Dwarf Star

Creators: Lindor, Bethlee M.; Hartman, Joel D.; Bakos, Gáspár Á.; Bhatti, Waqas; Csubry, Zoltán; Penev, Kaloyan; Bieryla, Allyson; Latham, David W.; Torres, Guillermo; Buchhave, Lars A.; de Val-Borro, Miguel; Howard, Andrew W.; Isaacson, Howard; Fulton, Benjamin J.; Boisse, Isabelle; Santerne, Alexandre; Hébrard, Guillaume; Kovács, Támás; Huang, Chelsea X.; Dembicky, Jack; Falco, Emilio; Everett, Mark E.; Horch, Elliott P.; Lázár, József; Papp, István; Sári, Pál

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Abstract

We report the discovery by the ground-based Hungarian-made Automated Telescope Network (HATNet) survey of the transiting exoplanet HAT-P-68b, which has a mass of 0.724 ± 0.043 M_J, and radius of 1.072 ± 0.012 R_J. The planet is in a circular P = 2.2984 day orbit around a moderately bright V = 13.937 ± 0.030 magnitude K-dwarf star of mass 0.673_(-0.014)^(+0.020) M_⊙, and radius 0.6726 ± 0.0069 R_⊙. The planetary nature of this system is confirmed through follow-up transit photometry obtained with the Fred L. Whipple Observatory (FLWO) 1.2 m telescope, high-precision radial velocities measured using Keck I/High Resolution Echelle Spectrometer (HIRES), FLWO 1.5 m/Tillinghast Reflector Echelle Spectrograph (TRES), and Observatoire de Haute-Provence (OHP) 1.9 m/Sophie, and high-spatial-resolution speckle imaging from WIYN 3.5 m/DSSI. HAT-P-68 is at an ecliptic latitude of +3° and outside the field of view of both the NASA Transiting Exoplanet Survey Satellite primary mission and the K2 mission. The large transit depth of 0.036 mag (r band) makes HAT-P-68b a promising target for atmospheric characterization via transmission spectroscopy.

Additional Information

© 2021. The American Astronomical Society. Received 2020 October 1; accepted 2020 October 27; published 2021 January 14. Based on observations obtained with the Hungarian-made Automated Telescope Network. Based in part on observations made with the Keck I telescope at Maunakea Observatory, Hawaii (Keck time awarded through NASA programs N133Hr and N169Hr). Based in part on observations obtained with the Tillinghast Reflector 1.5 m telescope and the 1.2 m telescope, both operated by the Smithsonian Astrophysical Observatory at the Fred Lawrence Whipple Observatory in Arizona. Based on radial velocities obtained with the Sophie spectrograph mounted on the 1.93 m telescope at Observatoire de Haute-Provence. HATNet operations have been funded by NASA grants NNG04GN74G as well as NNX13AJ15G. Follow-up of HATNet targets has been partially supported through NSF grant AST-1108686. B.L. is supported by the NSF Graduate Research Fellowship, grant no. DGE 1762114. J.H. acknowledges support from NASA grant NNX14AE87G. G.B., J.H., and W.B. acknowledge partial support from NASA grant NNX17AB61G. K.P. acknowledges support from NASA grant 80NSSC18K1009. I.B. thanks EuropeanCommunity's Seventh Framework Programme (FP7/2007-2013) under grant agreement number RG226604 (OPTICON) and the Programme National de Planétologie (PNP) of CNRS/INSU. We acknowledge partial support from the Kepler Mission under NASA Cooperative Agreement NCC2-1390 (PI: D.W.L.). Data presented in this paper are based on observations obtained at the HAT station at the Submillimeter Array of SAO, and the HAT station at the Fred Lawrence Whipple Observatory of SAO. We acknowledge the use of the AAVSO Photometric All-Sky Survey (APASS), funded by the Robert Martin Ayers Sciences Fund, and the SIMBAD database, operated at CDS, Strasbourg, France. Data presented herein were obtained at the WIYN Observatory from telescope time allocated to NN-EXPLORE through the scientific partnership of the National Aeronautics and Space Administration, the National Science Foundation, and the National Optical Astronomy Observatory. This work was supported by a NASA WIYN PI Data Award, administered by the NASA Exoplanet Science Institute. This work has made use of data from the European Space Agency (ESA) mission Gaia24 , processed by the Gaia Data Processing and Analysis Consortium (DPAC). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain. Facilities: HATNet - , FLWO:1.5 m (TRES) - , ARC (ARCES) - Astrophysical Research Consortium 3.5m Telescope at Apache Point Observatory, OHP:1.93 m (Sophie) - , Keck:I (HIRES) - KECK I Telescope, FLWO:1.2 m (KeplerCam) - , WIYN (DSSI) - Wisconsin-Indiana-Yale-NOAO Telescope, Gaia - , Exoplanet Archive - . Software: FITSH (Pál 2012), BLS (Kovács et al. 2002), VARTOOLS (Hartman & Bakos 2016), SPC (Buchhave et al. 2012), MWDUST (Bovy et al. 2016), Astropy (Astropy Collaboration et al. 2013; Price-Whelan et al. 2018).

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