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

Paul A. Dalba; Arvind F. Gupta; Joseph E. Rodriguez; Diana Dragomir; Chelsea X. Huang; Stephen R. Kane; Samuel N. Quinn; Allyson Bieryla; Gilbert A. Esquerdo; Benjamin J. Fulton; Nicholas Scarsdale; Natalie M. Batalha; Corey Beard; Aida Behmard; Ashley Chontos; Ian J.M. Crossfield; Courtney D. Dressing; Steven Giacalone; Michelle L. Hill; Lea A. Hirsch; Andrew W. Howard; Daniel Huber; Howard Isaacson; Molly Kosiarek; Jack Lubin; Andrew W. Mayo; Teo Mocnik; Joseph M. Akana Murphy; Erik A. Petigura; Paul Robertson; Lee J. Rosenthal; Arpita Roy; Ryan A. Rubenzahl; Judah Van Zandt; Lauren M. Weiss; Emil Knudstrup; Mads F. Andersen; Frank Grundahl; Xinyu Yao; Joshua Pepper; Steven Villanueva; David R. Ciardi; Ryan Cloutier; Thomas Lee Jacobs; Martti H. Kristiansen; Daryll M. Lacourse; Monika Lendl; Hugh P. Osborn; Enric Palle; Keivan G. Stassun; Daniel J. Stevens; George R. Ricker; Roland Vanderspek; David W. Latham; S. Seager; Joshua N. Winn; Jon M. Jenkins; Douglas A. Caldwell; Tansu Daylan; William Fong; Robert F. Goeke; Mark E. Rose; Pamela Rowden; Joshua E. Schlieder; Jeffrey C. Smith; Andrew Vanderburg

doi:10.3847/1538-3881/ab84e3

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

Paul A. Dalba, Arvind F. Gupta, Joseph E. Rodriguez, Diana Dragomir, Chelsea X. Huang, Stephen R. Kane, Samuel N. Quinn, Allyson Bieryla, Gilbert A. Esquerdo, Benjamin J. Fulton, Nicholas Scarsdale, Natalie M. Batalha, Corey Beard, Aida Behmard, Ashley Chontos, Ian J.M. Crossfield, Courtney D. Dressing, Steven Giacalone, Michelle L. Hill, Lea A. HirschAndrew W. Howard, Daniel Huber, Howard Isaacson, Molly Kosiarek, Jack Lubin, Andrew W. Mayo, Teo Mocnik, Joseph M. Akana Murphy, Erik A. Petigura, Paul Robertson, Lee J. Rosenthal, Arpita Roy, Ryan A. Rubenzahl, Judah Van Zandt, Lauren M. Weiss, Emil Knudstrup, Mads F. Andersen, Frank Grundahl, Xinyu Yao, Joshua Pepper, Steven Villanueva, David R. Ciardi, Ryan Cloutier, Thomas Lee Jacobs, Martti H. Kristiansen, Daryll M. Lacourse, Monika Lendl, Hugh P. Osborn, Enric Palle, Keivan G. Stassun, Daniel J. Stevens, George R. Ricker, Roland Vanderspek, David W. Latham, S. Seager, Joshua N. Winn, Jon M. Jenkins, Douglas A. Caldwell, Tansu Daylan, William Fong, Robert F. Goeke, Mark E. Rose, Pamela Rowden, Joshua E. Schlieder, Jeffrey C. Smith, Andrew Vanderburg

Astrophysical Sciences

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16 Scopus citations

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^+0.027R_J), sub-Saturn-mass (0.244±0.021M_J) 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.

Original language	English (US)
Article number	239
Journal	Astronomical Journal
Volume	159
Issue number	5
DOIs	https://doi.org/10.3847/1538-3881/ab84e3
State	Published - May 2020

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/1538-3881/ab84e3

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Dalba, P. A., Gupta, A. F., Rodriguez, J. E., Dragomir, D., Huang, C. X., Kane, S. R., Quinn, S. N., Bieryla, A., Esquerdo, G. A., Fulton, B. J., Scarsdale, N., Batalha, N. M., Beard, C., Behmard, A., Chontos, A., Crossfield, I. J. M., Dressing, C. D., Giacalone, S., Hill, M. L., ... Vanderburg, A. (2020). The TESS-Keck Survey. I. A Warm Sub-Saturn-mass Planet and a Caution about Stray Light in TESS Cameras. Astronomical Journal, 159(5), Article 239. https://doi.org/10.3847/1538-3881/ab84e3

@article{981e99a6e4b0481fa9f7a25636e1c9ea,

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

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.",

author = "Dalba, {Paul A.} and Gupta, {Arvind F.} and Rodriguez, {Joseph E.} and Diana Dragomir and Huang, {Chelsea X.} and Kane, {Stephen R.} and Quinn, {Samuel N.} and Allyson Bieryla and Esquerdo, {Gilbert A.} and Fulton, {Benjamin J.} and Nicholas Scarsdale and Batalha, {Natalie M.} and Corey Beard and Aida Behmard and Ashley Chontos and Crossfield, {Ian J.M.} and Dressing, {Courtney D.} and Steven Giacalone and Hill, {Michelle L.} and Hirsch, {Lea A.} and Howard, {Andrew W.} and Daniel Huber and Howard Isaacson and Molly Kosiarek and Jack Lubin and Mayo, {Andrew W.} and Teo Mocnik and {Akana Murphy}, {Joseph M.} and Petigura, {Erik A.} and Paul Robertson and Rosenthal, {Lee J.} and Arpita Roy and Rubenzahl, {Ryan A.} and {Van Zandt}, Judah and Weiss, {Lauren M.} and Emil Knudstrup and Andersen, {Mads F.} and Frank Grundahl and Xinyu Yao and Joshua Pepper and Steven Villanueva and Ciardi, {David R.} and Ryan Cloutier and Jacobs, {Thomas Lee} and Kristiansen, {Martti H.} and Lacourse, {Daryll M.} and Monika Lendl and Osborn, {Hugh P.} and Enric Palle and Stassun, {Keivan G.} and Stevens, {Daniel J.} and Ricker, {George R.} and Roland Vanderspek and Latham, {David W.} and S. Seager and Winn, {Joshua N.} and Jenkins, {Jon M.} and Caldwell, {Douglas A.} and Tansu Daylan and William Fong and Goeke, {Robert F.} and Rose, {Mark E.} and Pamela Rowden and Schlieder, {Joshua E.} and Smith, {Jeffrey C.} and Andrew Vanderburg",

year = "2020",

month = may,

doi = "10.3847/1538-3881/ab84e3",

language = "English (US)",

volume = "159",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "IOP Publishing Ltd.",

number = "5",

}

Dalba, PA, Gupta, AF, Rodriguez, JE, Dragomir, D, Huang, CX, Kane, SR, Quinn, SN, Bieryla, A, Esquerdo, GA, Fulton, BJ, Scarsdale, N, Batalha, NM, Beard, C, Behmard, A, Chontos, A, Crossfield, IJM, Dressing, CD, Giacalone, S, Hill, ML, Hirsch, LA, Howard, AW, Huber, D, Isaacson, H, Kosiarek, M, Lubin, J, Mayo, AW, Mocnik, T, Akana Murphy, JM, Petigura, EA, Robertson, P, Rosenthal, LJ, Roy, A, Rubenzahl, RA, Van Zandt, J, Weiss, LM, Knudstrup, E, Andersen, MF, Grundahl, F, Yao, X, Pepper, J, Villanueva, S, Ciardi, DR, Cloutier, R, Jacobs, TL, Kristiansen, MH, Lacourse, DM, Lendl, M, Osborn, HP, Palle, E, Stassun, KG, Stevens, DJ, Ricker, GR, Vanderspek, R, Latham, DW, Seager, S, Winn, JN, Jenkins, JM, Caldwell, DA, Daylan, T, Fong, W, Goeke, RF, Rose, ME, Rowden, P, Schlieder, JE, Smith, JC & Vanderburg, A 2020, 'The TESS-Keck Survey. I. A Warm Sub-Saturn-mass Planet and a Caution about Stray Light in TESS Cameras', Astronomical Journal, vol. 159, no. 5, 239. https://doi.org/10.3847/1538-3881/ab84e3

TY - JOUR

T1 - The TESS-Keck Survey. I. A Warm Sub-Saturn-mass Planet and a Caution about Stray Light in TESS Cameras

AU - Dalba, Paul A.

AU - Gupta, Arvind F.

AU - Rodriguez, Joseph E.

AU - Dragomir, Diana

AU - Huang, Chelsea X.

AU - Kane, Stephen R.

AU - Quinn, Samuel N.

AU - Bieryla, Allyson

AU - Esquerdo, Gilbert A.

AU - Fulton, Benjamin J.

AU - Scarsdale, Nicholas

AU - Batalha, Natalie M.

AU - Beard, Corey

AU - Behmard, Aida

AU - Chontos, Ashley

AU - Crossfield, Ian J.M.

AU - Dressing, Courtney D.

AU - Giacalone, Steven

AU - Hill, Michelle L.

AU - Hirsch, Lea A.

AU - Howard, Andrew W.

AU - Huber, Daniel

AU - Isaacson, Howard

AU - Kosiarek, Molly

AU - Lubin, Jack

AU - Mayo, Andrew W.

AU - Mocnik, Teo

AU - Akana Murphy, Joseph M.

AU - Petigura, Erik A.

AU - Robertson, Paul

AU - Rosenthal, Lee J.

AU - Roy, Arpita

AU - Rubenzahl, Ryan A.

AU - Van Zandt, Judah

AU - Weiss, Lauren M.

AU - Knudstrup, Emil

AU - Andersen, Mads F.

AU - Grundahl, Frank

AU - Yao, Xinyu

AU - Pepper, Joshua

AU - Villanueva, Steven

AU - Ciardi, David R.

AU - Cloutier, Ryan

AU - Jacobs, Thomas Lee

AU - Kristiansen, Martti H.

AU - Lacourse, Daryll M.

AU - Lendl, Monika

AU - Osborn, Hugh P.

AU - Palle, Enric

AU - Stassun, Keivan G.

AU - Stevens, Daniel J.

AU - Ricker, George R.

AU - Vanderspek, Roland

AU - Latham, David W.

AU - Seager, S.

AU - Winn, Joshua N.

AU - Jenkins, Jon M.

AU - Caldwell, Douglas A.

AU - Daylan, Tansu

AU - Fong, William

AU - Goeke, Robert F.

AU - Rose, Mark E.

AU - Rowden, Pamela

AU - Schlieder, Joshua E.

AU - Smith, Jeffrey C.

AU - Vanderburg, Andrew

PY - 2020/5

Y1 - 2020/5

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85106842630&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85106842630&partnerID=8YFLogxK

U2 - 10.3847/1538-3881/ab84e3

DO - 10.3847/1538-3881/ab84e3

M3 - Article

AN - SCOPUS:85106842630

SN - 0004-6256

VL - 159

JO - Astronomical Journal

JF - Astronomical Journal

IS - 5

M1 - 239

ER -

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

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