@article{6ac6481cdd0141169a9dabbec59b972b,
title = "A Transiting Super-Earth in the Radius Valley and an Outer Planet Candidate Around HD 307842",
abstract = "We report the confirmation of a TESS-discovered transiting super-Earth planet orbiting a mid-G star, HD 307842 (TOI-784). The planet has a period of 2.8 days, and the radial velocity (RV) measurements constrain the mass to be 9.67 − 0.82 + 0.83 M ⊕ . We also report the discovery of an additional planet candidate on an outer orbit that is most likely nontransiting. The possible periods of the planet candidate are approximately 20-63 days, with the corresponding RV semiamplitudes expected to range from 3.2 to 5.4 m s−1 and minimum masses from 12.6 to 31.1 M ⊕. The radius of the transiting planet (planet b) is 1.93 − 0.09 + 0.11 R ⊕ , which results in a mean density of 7.4 − 1.2 + 1.4 g cm − 3 suggesting that TOI-784 b is likely to be a rocky planet though it has a comparable radius to a sub-Neptune. We found TOI-784 b is located at the lower edge of the so-called “radius valley” in the radius versus insolation plane, which is consistent with the photoevaporation or core-powered mass-loss prediction. The TESS data did not reveal any significant transit signal of the planet candidate, and our analysis shows that the orbital inclinations of planet b and the planet candidate are 88.60 ° − 0.86 + 0.84 and ≤88.°3-89.°2, respectively. More RV observations are needed to determine the period and mass of the second object, and search for additional planets in this system.",
author = "Xinyan Hua and Wang, {Sharon Xuesong} and Teske, {Johanna K.} and Tianjun Gan and Avi Shporer and George Zhou and Stassun, {Keivan G.} and Markus Rabus and Howell, {Steve B.} and Carl Ziegler and Lissauer, {Jack J.} and Winn, {Joshua N.} and Jenkins, {Jon M.} and Ting, {Eric B.} and Collins, {Karen A.} and Mann, {Andrew W.} and Wei Zhu and Su Wang and Butler, {R. Paul} and Crane, {Jeffrey D.} and Shectman, {Stephen A.} and Bouma, {Luke G.} and C{\'e}sar Brice{\~n}o and Diana Dragomir and William Fong and Nicholas Law and Medina, {Jennifer V.} and Quinn, {Samuel N.} and Ricker, {George R.} and Schwarz, {Richard P.} and Sara Seager and Ramotholo Sefako and Chris Stockdale and Roland Vanderspek and Joel Villase{\~n}or",
note = "Funding Information: We thank Richard Grumitt for his insightful advice on MCMC and nested sampling for highly multimodal scenarios. We thank David Latham for his helpful suggestions about RV modeling. We thank Marshall Johnson for his contributions to the NRES RVs reduction. We thank Xiaochen Zheng for her helpful discussions about planet formation theory. D.D. acknowledges support from the TESS Guest Investigator Program grants 80NSSC21K0108 and 80NSSC22K0185. Hua and Wang acknowledge support from NSFC grant 12273016. We acknowledge the use of public TESS data from pipelines at the TESS Science Office and at the TESS Science Processing Operations Center. Resources supporting this work were provided by the NASA High-End Computing (HEC) Program through the NASA Advanced Supercomputing (NAS) Division at Ames Research Center for the production of the SPOC data products. This paper includes data collected with the TESS mission, obtained from the MAST data archive at the Space Telescope Science Institute (STScI). Funding for the TESS mission is provided by the NASA Explorer Program. STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 526555. All the TESS data used in this paper can be found in MAST DOI:10.17909/fwdt-2x66. This research has made use of the Exoplanet Follow-up Observation Program website, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program (DOI:10.26134/ExoFOP3). 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. This research uses data obtained through the Telescope Access Program (TAP), which has been funded by the TAP member institutes. This work makes use of observations from the Las Cumbres Observatory global telescope network. We acknowledge LCO Key Project (KEY2020B-005) which has kindly offered observing time for the target. This research has used data from the CTIO/SMARTS 1.5 m telescope, which is operated as part of the SMARTS Consortium by RECONS (www.recons.org) members Todd Henry, Hodari James, Wei-Chun Jao, and Leonardo Paredes. At the telescope, observations were carried out by Roberto Aviles and Rodrigo Hinojosa. Funding Information: We thank Richard Grumitt for his insightful advice on MCMC and nested sampling for highly multimodal scenarios. We thank David Latham for his helpful suggestions about RV modeling. We thank Marshall Johnson for his contributions to the NRES RVs reduction. We thank Xiaochen Zheng for her helpful discussions about planet formation theory. D.D. acknowledges support from the TESS Guest Investigator Program grants 80NSSC21K0108 and 80NSSC22K0185. Hua and Wang acknowledge support from NSFC grant 12273016. We acknowledge the use of public TESS data from pipelines at the TESS Science Office and at the TESS Science Processing Operations Center. Resources supporting this work were provided by the NASA High-End Computing (HEC) Program through the NASA Advanced Supercomputing (NAS) Division at Ames Research Center for the production of the SPOC data products. This paper includes data collected with the TESS mission, obtained from the MAST data archive at the Space Telescope Science Institute (STScI). Funding for the TESS mission is provided by the NASA Explorer Program. STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 526555. All the TESS data used in this paper can be found in MAST DOI: 10.17909/fwdt-2x66 . This research has made use of the Exoplanet Follow-up Observation Program website, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program (DOI: 10.26134/ExoFOP3 ). 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. This research uses data obtained through the Telescope Access Program (TAP), which has been funded by the TAP member institutes. This work makes use of observations from the Las Cumbres Observatory global telescope network. We acknowledge LCO Key Project (KEY2020B-005) which has kindly offered observing time for the target. This research has used data from the CTIO/SMARTS 1.5 m telescope, which is operated as part of the SMARTS Consortium by RECONS ( www.recons.org ) members Todd Henry, Hodari James, Wei-Chun Jao, and Leonardo Paredes. At the telescope, observations were carried out by Roberto Aviles and Rodrigo Hinojosa. Publisher Copyright: {\textcopyright} 2023. The Author(s). Published by the American Astronomical Society.",
year = "2023",
month = jul,
day = "1",
doi = "10.3847/1538-3881/acd751",
language = "English (US)",
volume = "166",
journal = "Astronomical Journal",
issn = "0004-6256",
publisher = "IOP Publishing Ltd.",
number = "1",
}