TOI-1670 b and c: An Inner Sub-Neptune with an Outer Warm Jupiter Unlikely to Have Originated from High-eccentricity Migration

Quang H. Tran, Brendan P. Bowler, Michael Endl, William D. Cochran, Phillip J. MacQueen, Davide Gandolfi, Carina M. Persson, Malcolm Fridlund, Enric Palle, Grzegorz Nowak, Hans J. Deeg, Rafael Luque, John H. Livingston, Petr Kabáth, Marek Skarka, Ján Šubjak, Steve B. Howell, Simon H. Albrecht, Karen A. Collins, Massimiliano EspositoVincent Van Eylen, Sascha Grziwa, Elisa Goffo, Chelsea X. Huang, Jon M. Jenkins, Marie Karjalainen, Raine Karjalainen, Emil Knudstrup, Judith Korth, Kristine W.F. Lam, David W. Latham, Alan M. Levine, H. L.M. Osborne, Samuel N. Quinn, Seth Redfield, George R. Ricker, S. Seager, Luisa Maria Serrano, Alexis M.S. Smith, Joseph D. Twicken, Joshua N. Winn

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


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 ( Rb=2.06-0.15+0.19 R) on a 10.9 day orbit, and TOI-1670 c is a warm Jupiter ( Rc=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 Mc=0.63-0.08+0.09 M Jup for the outer warm Jupiter, implying a mean density of ρc=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 ( ec=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.

Original languageEnglish (US)
Article number225
JournalAstronomical Journal
Issue number5
StatePublished - May 1 2022

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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