The TESS–Keck Survey. I. A Warm Sub-Saturn-mass Planet and a Caution about Stray Light in TESS Cameras

Dalba, Paul A. and Gupta, Arvind F. and Rodriguez, Joseph E. and Dragomir, Diana and Huang, Chelsea X. ORCID: https://orcid.org/0000-0003-0918-7484 and Kane, Stephen R. and Quinn, Samuel N. and Bieryla, Allyson and Esquerdo, Gilbert A. and Fulton, Benjamin J. and Scarsdale, Nicholas and Batalha, Natalie M. and Beard, Corey and Behmard, Aida and Chontos, Ashley and Crossfield, Ian J. M. and Dressing, Courtney D. and Giacalone, Steven and Hill, Michelle L. and Hirsch, Lea A. and Howard, Andrew W. and Huber, Daniel and Isaacson, Howard and Kosiarek, Molly and Lubin, Jack and Mayo, Andrew W. and Mocnik, Teo and Akana Murphy, Joseph M. and Petigura, Erik A. and Robertson, Paul and Rosenthal, Lee J. and Roy, Arpita and Rubenzahl, Ryan A. and Van Zandt, Judah and Weiss, Lauren M. and Knudstrup, Emil and Andersen, Mads F. and Grundahl, Frank and Yao, Xinyu and Pepper, Joshua and Villanueva, Steven, Jr. and Ciardi, David R. and Cloutier, Ryan and Jacobs, Thomas Lee and Kristiansen, Martti H. and LaCourse, Daryll M. and Lendl, Monika and Osborn, Hugh P. and Palle, Enric and Stassun, Keivan G. and Stevens, Daniel J. and Ricker, George R. and Vanderspek, Roland and Latham, David W. and Seager, S. and Winn, Joshua N. and Jenkins, Jon M. and Caldwell, Douglas A. and Daylan, Tansu and Fong, William and Goeke, Robert F. and Rose, Mark E. and Rowden, Pamela and Schlieder, Joshua E. and Smith, Jeffrey C. and Vanderburg, Andrew (2020) The TESS–Keck Survey. I. A Warm Sub-Saturn-mass Planet and a Caution about Stray Light in TESS Cameras. The Astronomical Journal, 159 (5):239. pp. 1-13. ISSN 0004-6256

[img]
Preview
Text (Published Version)
Dalba_2020_AJ_159_241.pdf

Download (1MB) | Preview

Abstract

We report the detection of a Saturn-size exoplanet orbiting HD 332231 (TOI 1456) in light curves from the Transiting Exoplanet Survey Satellite (TESS). HD 332231 - an F8 dwarf star with a V-band magnitude of 8.56 - was observed by TESS in Sectors 14 and 15. We detect a single-transit event in the Sector 15 presearch data conditioning (PDC) light curve. We obtain spectroscopic follow-up observations of HD 332231 with the Automated Planet Finder, Keck I, and SONG telescopes. The orbital period we infer from radial velocity (RV) observations leads to the discovery of another transit in Sector 14 that was masked by PDC due to scattered light contamination. A joint analysis of the transit and RV data confirms the planetary nature of HD 332231 b, a Saturn-size (0.867-0.025+0.027RJ), sub-Saturn-mass (0.244±0.021MJ) exoplanet on a 18.71 day circular orbit. The low surface gravity of HD 332231 b and the relatively low stellar flux it receives make it a compelling target for transmission spectroscopy. Also, the stellar obliquity is likely measurable via the Rossiter-McLaughlin effect, an exciting prospect given the 0.14 au orbital separation of HD 332231 b. The spectroscopic observations do not provide substantial evidence for any additional planets in the HD 332231 system, but continued RV monitoring is needed to further characterize this system. We also predict that the frequency and duration of masked data in the PDC light curves for TESS Sectors 14-16 could hide transits of some exoplanets with orbital periods between 10.5 and 17.5 days.


Statistics for USQ ePrint 47428
Statistics for this ePrint Item
Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version deposited in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Date Deposited: 01 Apr 2022 01:32
Last Modified: 19 May 2022 03:25
Uncontrolled Keywords: Exoplanet astronomy (486); Radial velocity (1332); Transit photometry (1709); Exoplanet detection methods (489); Exoplanets (498); F dwarf stars (516); Spectroscopy (1558); Direct imaging (387); Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Instrumentation and Methods for Astrophysics; Astrophysics - Solar and Stellar Astrophysics
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Identification Number or DOI: https://doi.org/10.3847/1538-3881/ab84e3
URI: http://eprints.usq.edu.au/id/eprint/47428

Actions (login required)

View Item Archive Repository Staff Only