HAT-P-67b: An Extremely Low Density Saturn Transiting an F-subgiant Confirmed via Doppler Tomography

Zhou, G. ORCID: https://orcid.org/0000-0002-4891-3517 and Bakos, G. A. and Hartman, J. D. and Latham, D. W. and Torres, G. and Bhatti, W. and Penev, K. and Buchhave, L. and Kovacs, G. and Bieryla, A. and Quinn, S. and Isaacson, H. and Fulton, B. J. and Falco, E. and Csubry, Z. and Everett, M. and Szklenar, T. and Esquerdo, G. and Berlind, P. and Calkins, M. L. and Beky, B. and Knox, R. P. and Hinz, P. and Horch, E. P. and Hirsch, L. and Howell, S. B. and Noyes, R. W. and Marcy, G. and de Val-Borro, M. and Lazar, J. and Papp, I. and Sari, P. (2017) HAT-P-67b: An Extremely Low Density Saturn Transiting an F-subgiant Confirmed via Doppler Tomography. The Astronomical Journal, 153 (5):211. pp. 1-13. ISSN 0004-6256

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We report the discovery of HAT-P-67b, which is a hot-Saturn transiting a rapidly rotating F-subgiant. HAT-P-67b has a radius of Rp=2.085 -0.071 +0.096 RJ, and orbites a M∗ = 1.642-0.072 +0.155 M, R∗ = 2.546-0.099 +0.0084 R host star in a ∼4.81 day period orbit. We place an upper limit on the mass of the planet via radial velocity measurements to be Mp < 0.59 MJ, and a lower limit of >0.056 MJ by limitations on Roche lobe overflow. Despite being a subgiant, the host star still exhibits relatively rapid rotation, with a projected rotational velocity of v sin I∗ = 35.8 ±1.1 km s-1, which makes it difficult to precisely determine the mass of the planet using radial velocities. We validated HAT-P-67b via two Doppler tomographic detections of the planetary transit, which eliminate potential eclipsing binary blend scenarios. The Doppler tomographic observations also confirm that HAT-P-67b has an orbit that is aligned to within 12, in projection, with the spin of its host star. HAT-P-67b receives strong UV irradiation and is among one of the lowest density planets known, which makes it a good candidate for future UV transit observations in the search for an extended hydrogen exosphere.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 03 Feb 2022 03:36
Last Modified: 07 Feb 2022 00:11
Uncontrolled Keywords: planetary systems; stars: individual (HAT-P-67); techniques: photometric; techniques: spectroscopic; Astrophysics - Earth; Planetary Astrophysics
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
Identification Number or DOI: https://doi.org/10.3847/1538-3881/aa674a
URI: http://eprints.usq.edu.au/id/eprint/45041

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