dc.contributor.author | Seager, Sara | |
dc.date.accessioned | 2023-03-02T19:20:16Z | |
dc.date.available | 2023-03-02T19:20:16Z | |
dc.date.issued | 2022 | |
dc.identifier.uri | https://hdl.handle.net/1721.1/148283 | |
dc.description.abstract | It is commonly accepted that exoplanets with orbital periods shorter than 1
day, also known as ultra-short period (USP) planets, formed further out within
their natal protoplanetary disk, before migrating to their current-day orbits
via dynamical interactions. One of the most accepted theories suggests a
violent scenario involving high-eccentricity migration followed by tidal
circularization. Here, we present the discovery of a four planet system
orbiting the bright (V=10.5) K6 dwarf star TOI-500. The innermost planet is a
transiting, Earth-sized USP planet with an orbital period of $\sim$ 13 hours, a
mass of 1.42 $\pm$ 0.18 M$_{\oplus}$, a radius of $1.166^{0.061}_{-0.058}$
R$_{\oplus}$, and a mean density of 4.89$^{+1.03}_{-0.88}$ gcm$^{-3}$. Via
Doppler spectroscopy, we discovered that the system hosts three outer planets
on nearly circular orbits with periods of 6.6, 26.2, and 61.3d and minimum
masses of 5.03 $\pm$ 0.41 M$_{\oplus}$, 33.12 $\pm$ 0.88 M$_{\oplus}$ and
15.05$^{+1.12}_{-1.11}$ M$_{\oplus}$, respectively. The presence of both a USP
planet and a low-mass object on a 6.6-day orbit indicates that the architecture
of this system can be explained via a scenario in which the planets started on
low-eccentricity orbits, then moved inwards through a quasi-static secular
migration. Our numerical simulations show that this migration channel can bring
TOI-500 b to its current location in 2 Gyrs, starting from an initial orbit of
0.02au. TOI-500 is the first four planet system known to host a USP Earth
analog whose current architecture can be explained via a non-violent migration
scenario. | en_US |
dc.language.iso | en | |
dc.publisher | Springer Science and Business Media LLC | en_US |
dc.relation.isversionof | 10.1038/S41550-022-01641-Y | en_US |
dc.rights | Creative Commons Attribution-Noncommercial-Share Alike | en_US |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-sa/4.0/ | en_US |
dc.source | arXiv | en_US |
dc.title | A low-eccentricity migration pathway for a 13-h-period Earth analogue in a four-planet system | en_US |
dc.type | Article | en_US |
dc.identifier.citation | Seager, Sara. 2022. "A low-eccentricity migration pathway for a 13-h-period Earth analogue in a four-planet system." Nature Astronomy, 6 (6). | |
dc.contributor.department | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences | en_US |
dc.relation.journal | Nature Astronomy | en_US |
dc.eprint.version | Author's final manuscript | en_US |
dc.type.uri | http://purl.org/eprint/type/JournalArticle | en_US |
eprint.status | http://purl.org/eprint/status/PeerReviewed | en_US |
dc.date.updated | 2023-03-02T18:21:44Z | |
dspace.orderedauthors | Serrano, LM; Gandolfi, D; Mustill, AJ; Barragán, O; Korth, J; Dai, F; Redfield, S; Fridlund, M; Lam, KWF; Díaz, MR; Grziwa, S; Collins, KA; Livingston, JH; Cochran, WD; Hellier, C; Bellomo, SE; Trifonov, T; Rodler, F; Alarcon, J; Jenkins, JM; Latham, DW; Ricker, G; Seager, S; Vanderspeck, R; Winn, JN; Albrecht, S; Collins, KI; Csizmadia, S; Daylan, T; Deeg, HJ; Esposito, M; Fausnaugh, M; Georgieva, I; Goffo, E; Guenther, E; Hatzes, AP; Howell, SB; Jensen, ELN; Luque, R; Mann, AW; Murgas, F; Osborne, HLM; Palle, E; Persson, CM; Rowden, P; Rudat, A; Smith, AMS; Twicken, JD; Van Eylen, V; Ziegler, C | en_US |
dspace.date.submission | 2023-03-02T18:21:48Z | |
mit.journal.volume | 6 | en_US |
mit.journal.issue | 6 | en_US |
mit.license | OPEN_ACCESS_POLICY | |
mit.metadata.status | Authority Work and Publication Information Needed | en_US |