TOI-1670 b and c: An Inner Sub-Neptune with an Outer Warm Jupiter Unlikely to Have Originated from High-eccentricity Migration
Author:
Tran Quang H.ORCID, Bowler Brendan P.ORCID, Endl MichaelORCID, Cochran William D.ORCID, MacQueen Phillip J., Gandolfi DavideORCID, Persson Carina M.ORCID, Fridlund MalcolmORCID, Palle EnricORCID, Nowak GrzegorzORCID, Deeg Hans J.ORCID, Luque RafaelORCID, Livingston John H.ORCID, Kabáth PetrORCID, Skarka MarekORCID, Šubjak JánORCID, Howell Steve B.ORCID, Albrecht Simon H.ORCID, Collins Karen A.ORCID, Esposito MassimilianoORCID, Van Eylen VincentORCID, Grziwa SaschaORCID, Goffo ElisaORCID, Huang Chelsea X.ORCID, Jenkins Jon M.ORCID, Karjalainen MarieORCID, Karjalainen RaineORCID, Knudstrup EmilORCID, Korth JudithORCID, Lam Kristine W. F.ORCID, Latham David W.ORCID, Levine Alan M.ORCID, Osborne H. L. M.ORCID, Quinn Samuel N.ORCID, Redfield SethORCID, Ricker George R.ORCID, Seager S.ORCID, Serrano Luisa Maria, Smith Alexis M. S.ORCID, Twicken Joseph D.ORCID, Winn Joshua N.ORCID
Abstract
Abstract
We report the discovery of two transiting planets around the bright (V = 9.9 mag) main-sequence F7 star TOI-1670 by the Transiting Exoplanet Survey Satellite. TOI-1670 b is a sub-Neptune (
R
b
=
2.06
−
0.15
+
0.19
R
⊕) on a 10.9 day orbit, and TOI-1670 c is a warm Jupiter (
R
c
=
0.987
−
0.025
+
0.025
R
Jup) on a 40.7 day orbit. Using radial velocity observations gathered with the Tull Coudé Spectrograph on the Harlan J. Smith telescope and HARPS-N on the Telescopio Nazionale Galileo, we find a planet mass of
M
c
=
0.63
−
0.08
+
0.09
M
Jup for the outer warm Jupiter, implying a mean density of
ρ
c
=
0.81
−
0.11
+
0.13
g cm−3. The inner sub-Neptune is undetected in our radial velocity data (M
b < 0.13 M
Jup at the 99% confidence level). Multiplanet systems like TOI-1670 hosting an outer warm Jupiter on a nearly circular orbit (
e
c
=
0.09
−
0.04
+
0.05
) and one or more inner coplanar planets are more consistent with “gentle” formation mechanisms such as disk migration or in situ formation rather than high-eccentricity migration. Of the 11 known systems with a warm Jupiter and a smaller inner companion, eight (73%) are near a low-order mean-motion resonance, which can be a signature of migration. TOI-1670 joins two other systems (27% of this subsample) with period commensurabilities greater than 3, a common feature of in situ formation or halted inward migration. TOI-1670 and the handful of similar systems support a diversity of formation pathways for warm Jupiters.
Funder
NASA ∣ GSFC ∣ Astrophysics Science Division National Science Foundation MEXT ∣ Japan Society for the Promotion of Science Swedish National Space Agency
Publisher
American Astronomical Society
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
7 articles.
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