TOI-1670 b and c : An Inner Sub-Neptune with an Outer Warm Jupiter Unlikely to Have Originated from High-eccentricity Migration
(2022) In Astronomical Journal 163(5).- 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 ( 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... (More)
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.
(Less)
- author
- publishing date
- 2022-05-01
- type
- Contribution to journal
- publication status
- published
- in
- Astronomical Journal
- volume
- 163
- issue
- 5
- article number
- 225
- publisher
- IOP Publishing
- external identifiers
-
- scopus:85129611035
- ISSN
- 0004-6256
- DOI
- 10.3847/1538-3881/ac5c4f
- language
- English
- LU publication?
- no
- additional info
- Publisher Copyright: © 2022. The Author(s). Published by the American Astronomical Society.
- id
- 4a848d24-d46e-421c-bc52-6f5c72ea6dcd
- date added to LUP
- 2023-02-01 09:24:35
- date last changed
- 2023-02-03 10:25:45
@article{4a848d24-d46e-421c-bc52-6f5c72ea6dcd,
abstract = {{<p>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.</p>}},
author = {{Tran, Quang H. and Bowler, Brendan P. and Endl, Michael and Cochran, William D. and MacQueen, Phillip J. and Gandolfi, Davide and Persson, Carina M. and Fridlund, Malcolm and Palle, Enric and Nowak, Grzegorz and Deeg, Hans J. and Luque, Rafael and Livingston, John H. and Kabáth, Petr and Skarka, Marek and Šubjak, Ján and Howell, Steve B. and Albrecht, Simon H. and Collins, Karen A. and Esposito, Massimiliano and Van Eylen, Vincent and Grziwa, Sascha and Goffo, Elisa and Huang, Chelsea X. and Jenkins, Jon M. and Karjalainen, Marie and Karjalainen, Raine and Knudstrup, Emil and Korth, Judith and Lam, Kristine W. F. and Latham, David W. and Levine, Alan M. and Osborne, H. L. M. and Quinn, Samuel N. and Redfield, Seth and Ricker, George R. and Seager, S. and Serrano, Luisa Maria and Smith, Alexis M. S. and Twicken, Joseph D. and Winn, Joshua N.}},
issn = {{0004-6256}},
language = {{eng}},
month = {{05}},
number = {{5}},
publisher = {{IOP Publishing}},
series = {{Astronomical Journal}},
title = {{TOI-1670 b and c : An Inner Sub-Neptune with an Outer Warm Jupiter Unlikely to Have Originated from High-eccentricity Migration}},
url = {{http://dx.doi.org/10.3847/1538-3881/ac5c4f}},
doi = {{10.3847/1538-3881/ac5c4f}},
volume = {{163}},
year = {{2022}},
}