A Caltech Library Service

KELT-16b: A Highly Irradiated, Ultra-short Period Hot Jupiter Nearing Tidal Disruption

Oberst, Thomas E. and Ngo, Henry and Mawet, Dimitri and Calchi Novati, Sebastiano and Fulton, Benjamin J. (2017) KELT-16b: A Highly Irradiated, Ultra-short Period Hot Jupiter Nearing Tidal Disruption. Astronomical Journal, 153 (3). Art. No. 97. ISSN 0004-6256.

[img] PDF - Published Version
See Usage Policy.

[img] PDF - Submitted Version
See Usage Policy.


Use this Persistent URL to link to this item:


We announce the discovery of KELT-16b, a highly irradiated, ultra-short period hot Jupiter transiting the relatively bright (V = 11.7) star TYC 2688-1839-1/KELT-16. A global analysis of the system shows KELT-16 to be an F7V star with T_(eff) = 6236 ± 54 K, log g⋆ = 4.253^(+0.031)_(-0.036), [Fe/H] = -0.002^(+0.086)_(-0.085), M⋆ = 1.211^(+0.043)_(-0.046) M⊙, and R⋆ = 1.360^(+0.064)_(-0.15)R⊙. The planet is a relatively high-mass inflated gas giant with M_P = 2.75^(+0.16)_(-0.15)M_J, R_P = 1.415^(+0.084)_(-0.067)R_J, density Ρ_p = 1.20 ± 0.18 g cm^(−3), surface gravity Log g_P = 3.530^(+0.042)_(-0.049), and T_(eq) = 2453^(+55)_(-47)K. The best-fitting linear ephemeris is T_C = 2457247.24791 ± 0.00019 BJD_(TBD) and P = 0.9689951 ± 0.0000024 day. KELT-16b joins WASP-18b, −19b, −43b, −103b, and HATS-18b as the only giant transiting planets with P < 1 day. Its ultra-short period and high irradiation make it a benchmark target for atmospheric studies by the Hubble Space Telescope, Spitzer, and eventually the James Webb Space Telescope. For example, as a hotter, higher-mass analog of WASP-43b, KELT-16b may feature an atmospheric temperature–pressure inversion and day-to-night temperature swing extreme enough for TiO to rain out at the terminator. KELT-16b could also join WASP-43b in extending tests of the observed mass–metallicity relation of the solar system gas giants to higher masses. KELT-16b currently orbits at a mere ~1.7 Roche radii from its host star, and could be tidally disrupted in as little as a few ×105 years (for a stellar tidal quality factor of Q’* = 10^5). Finally, the likely existence of a widely separated bound stellar companion in the KELT-16 system makes it possible that Kozai–Lidov (KL) oscillations played a role in driving KELT-16b inward to its current precarious orbit.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Ngo, Henry0000-0001-5172-4859
Mawet, Dimitri0000-0002-8895-4735
Calchi Novati, Sebastiano0000-0002-7669-1069
Fulton, Benjamin J.0000-0003-3504-5316
Additional Information:© 2017 The American Astronomical Society. Received 2016 July 30; revised 2016 December 23; accepted 2016 December 29; published 2017 February 7. We thank an anonymous referee for thoughtfully reviewing this manuscript and offering several helpful suggestions. T.E.O. acknowledges a sabbatical award from Westminster College. B.S.G. and D.J.S. acknowledge support from NSF CAREER Grant AST-1056524. D.A. acknowledges support from an appointment to the NASA Postdoctoral Program at Goddard Space Flight Center, administered by the Universities Space Research Association (USRA) through a contract with NASA. K.K.M. acknowledges the purchase of SDSS filters for Whitin Observatory by the Theodore Dunham, Jr., Grant of the Fund for Astronomical Research. The AO data in this work were obtained at the W.M. Keck Observatory, which was financed by the W.M. Keck Foundation and is operated as a scientific partnership between the California Institute of Technology, the University of California, and NASA. In addition, this research has made use of the following services and databases: The Smithsonian Astrophysical Observatory/NASA Astrophysics Data System (SAO/NASA ADS); Vizier (Ochsenbein et al. 2000); The SIMBAD Astronomical Database (Wenger et al. 2000); The Spanish Virtual Observatory (SVO) Filter Profile Service (; and the American Association of Variable Star Observers (AAVSO) Photometric All-Sky Survey (APASS), whose funding is provided by the Robert Martin Ayers Sciences Fund and the AAVSO Endowment (
Group:Infrared Processing and Analysis Center (IPAC), Astronomy Department
Funding AgencyGrant Number
Westminster CollegeUNSPECIFIED
NASA Postdoctoral ProgramUNSPECIFIED
Fund for Astronomical ResearchUNSPECIFIED
W. M. Keck FoundationUNSPECIFIED
Subject Keywords:planets and satellites: detection – planets and satellites: gaseous planets – methods: observational – techniques: photometric – techniques: radial velocities
Issue or Number:3
Record Number:CaltechAUTHORS:20170208-100601219
Persistent URL:
Official Citation:Thomas E. Oberst et al 2017 AJ 153 97
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:74153
Deposited By: Tony Diaz
Deposited On:08 Feb 2017 20:01
Last Modified:03 Oct 2019 16:35

Repository Staff Only: item control page