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A long-period substellar object exhibiting a single transit in Kepler

Quinn, Samuel N. and Rappaport, Saul and Vanderburg, Andrew and Eastman, Jason D. and Nelson, Lorne A. and Jacobs, Thomas L. and LaCourse, Daryll M. and Schmitt, Allan R. and Berlind, Perry and Calkins, Michael L. and Esquerdo, Gilbert A. and Howard, Andrew W. and Isaacson, Howard and Latham, David W. (2021) A long-period substellar object exhibiting a single transit in Kepler. . (Unpublished)

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We report the detection of a single transit-like signal in the Kepler data of the slightly evolved F star KIC4918810. The transit duration is ~45 hours, and while the orbital period (P ∼10 years) is not well constrained, it is one of the longest among companions known to transit. We calculate the size of the transiting object to be R_P = 0.910 R_J. Objects of this size vary by orders of magnitude in their densities, encompassing masses between that of Saturn (0.3 M_J) and stars above the hydrogen-burning limit (~80 M_J). Radial-velocity observations reveal that the companion is unlikely to be a star. The mass posterior is bimodal, indicating a mass of either ~0.24 M_J or ~26 M_J. Continued spectroscopic monitoring should either constrain the mass to be planetary or detect the orbital motion, the latter of which would yield a benchmark long-period brown dwarf with a measured mass, radius, and age.

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
Quinn, Samuel N.0000-0002-8964-8377
Rappaport, Saul0000-0003-3182-5569
Vanderburg, Andrew0000-0001-7246-5438
Eastman, Jason D.0000-0003-3773-5142
Nelson, Lorne A.0000-0002-6916-8130
Jacobs, Thomas L.0000-0003-3988-3245
LaCourse, Daryll M.0000-0002-8527-2114
Schmitt, Allan R.0000-0002-5034-0949
Calkins, Michael L.0000-0002-2830-5661
Esquerdo, Gilbert A.0000-0002-9789-5474
Howard, Andrew W.0000-0001-8638-0320
Isaacson, Howard0000-0002-0531-1073
Latham, David W.0000-0001-9911-7388
Additional Information:Attribution 4.0 International (CC BY 4.0) This paper includes data collected by the Kepler mission and obtained from the MAST data archive at the Space Telescope Science Institute (STScI). Funding for the Kepler mission is provided by the NASA Science Mission Directorate. STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. This work has also made use of data from the European Space Agency (ESA) mission Gaia (, 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. Some of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. 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. This research has made use of NASA’s Astrophysics Data System Bibliographic Services. Facilities: Kepler, FLWO:1.5m (TRES), Keck:I (HIRES), Gaia Software: EXOFASTv2 (Eastman 2017; Eastman et al. 2019)
Group:Astronomy Department
Funding AgencyGrant Number
NASANAS 5-26555
Gaia Multilateral AgreementUNSPECIFIED
W. M. Keck FoundationUNSPECIFIED
Record Number:CaltechAUTHORS:20211018-185204670
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:111514
Deposited By: George Porter
Deposited On:19 Oct 2021 15:06
Last Modified:19 Oct 2021 15:06

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