TOI-757 b: an eccentric transiting mini-Neptune on a 17.5-d orbit

• Type: Article in International Scientific Journal
• Date: 2024

Authors

Villaver, E (Author) Other; Villaseñor, J (Author) Other; Viotto, V (Author) Other; Walter, (Author) Other; Walton, NA (Author) Other; Winn, JN (Author) Other; Yee, SW (Author) Other; Alqasim, A (Author) Other; Grieves, N (Author) Other; Rosário, NM (Author) Other; Gandolfi, D (Author) Other; Livingston, JH (Author) Other; Sousa, SG (Author) FCUP; Collins, KA (Author) Other; Teske, JK (Author) Other; Fridlund, M (Author) Other; Egger, JA (Author) Other; Cabrera, J (Author) Other; Hellier, C (Author) Other; Lanza, AF (Author) Other; Van Eylen, V (Author) Other; Bouchy, F (Author) Other; Oelkers, RJ (Author) Other; Srdoc, G (Author) Other; Shectman, S (Author) Other; Günther, M (Author) Other; Goffo, E (Author) Other; Wilson, T (Author) Other; Serrano, LM (Author) Other; Brandeker, A (Author) Other; Wang, SX (Author) Other; Heitzmann, A (Author) Other; Bonfanti, A (Author) Other; Fossati, L (Author) Other; Alibert, Y (Author) Other; Delrez, L (Author) Other; Sefako, R (Author) Other; Barros, S (Author) Other; Collins, K (Author) Other; Demangeon, ODS (Author) Other; Albrecht, SH (Author) Other; Alonso, R (Author) Other; Asquier, J (Author) Other; Barczy, T (Author) Other; Barrado, D (Author) Other; Baumjohann, W (Author) Other; Beck, T (Author) Other; Benz, W (Author) Other; Billot, N (Author) Other; Borsato, L (Author) Other; Broeg, C (Author) Other; Bryant, EM (Author) Other; Butler, RP (Author) Other; Cochran, WD (Author) Other; Cameron, AC (Author) Other; Correia, ACM (Author) Other; Crane, JD (Author) Other; Csizmadia, S (Author) Other; Cubillos, PE (Author) Other; Davies, MB (Author) Other; Daylan, T (Author) Other; Deleuil, M (Author) Other; Deline, A (Author) Other; Demory, BO (Author) Other; Derekas, A (Author) Other; Edwards, B (Author) Other; Ehrenreich, D (Author) Other; Erikson, A (Author) Other; Essack, Z (Author) Other; Fortier, A (Author) Other; Gazeas, K (Author) Other; Gillon, M (Author) Other; Gudel, M (Author) Other; Hasiba, J (Author) Other; Hatzes, AP (Author) Other; Helling, C (Author) Other; Hirano, T (Author) Other; Howell, SB (Author) Other; Hoyer, S (Author) Other; Isaak, KG (Author) Other; Jenkins, JM (Author) Other; Kanodia, S (Author) Other; Kiss, LL (Author) Other; Korth, J (Author) Other; Lam, KWF (Author) Other; Laskar, J (Author) Other; des Etangs, AL (Author) Other; Lendl, M (Author) Other; Lund, MB (Author) Other; Luque, R (Author) Other; Mann, AW (Author) Other; Magrin, D (Author) Other; Maxted, PFL (Author) Other; Mordasini, C (Author) Other; Narita, N (Author) Other; Nascimbeni, (Author) Other; Nowak, G (Author) Other; Olofsson, G (Author) Other; Osborn, HP (Author) Other; Osborne, HLM (Author) Other; Osip, D (Author) Other; Ottensamer, R (Author) Other; Pagano, (Author) Other; Palle, E (Author) Other; Peter, G (Author) Other; Piotto, G (Author) Other; Pollacco, D (Author) Other; Queloz, D (Author) Other; Ragazzoni, R (Author) Other; Rando, N (Author) Other; Rauer, H (Author) Other; Redfield, S (Author) Other; Ribas, (Author) Other; Rice, M (Author) Other; Ricker, GR (Author) Other; Rieder, M (Author) Other; Salmon, S (Author) Other; N.C. Santos (Author) FCUP; Scandariato, G (Author) Other; Seager, S (Author) Other; Segransan, D (Author) Other; Shporer, A (Author) Other; Simon, AE (Author) Other; Smith, AMS (Author) Other; Stalport, M (Author) Other; Szabo, GM (Author) Other; Thompson, (Author) Other; Twicken, JD (Author) Other; Udry, S (Author) Other; Vanderspek, R (Author) Other; Van Grootel, V (Author) Other; Venturini, J (Author) Other

Journal

Title: Monthly Notices of the Royal Astronomical Society

Vol. 533

Pages: 1-26

ISSN: 0035-8711

Publisher: Oxford University Press

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 0 Citations

Other information

Authenticus ID: P-013-WK7

DOI: 10.1093/mnras/stae1767

Abstract (EN): We report the spectroscopic confirmation and fundamental properties of TOI-757 b, a mini-Neptune on a 17.5-d orbit transiting a bright star (V = 9.7 mag) discovered by the TESS mission. We acquired high-precision radial velocity measurements with the HARPS, ESPRESSO, and PFS spectrographs to confirm the planet detection and determine its mass. We also acquired space-borne transit photometry with the CHEOPS space telescope to place stronger constraints on the planet radius, supported with ground-based LCOGT photometry. WASP and KELT photometry were used to help constrain the stellar rotation period. We also determined the fundamental parameters of the host star. We find that TOI-757 b has a radius of R-p = 2.5 +/- 0.1 R-circle plus and a mass of M-p = 10.5(-2.1)(+2.2) M-circle plus, implying a bulk density of rho(p) = 3.6 +/- 0.8 g cm(-3). Our internal composition modelling was unable to constrain the composition of TOI-757 b, highlighting the importance of atmospheric observations for the system. We also find the planet to be highly eccentric with e = 0.39(-0.07)(+0.08), making it one of the very few highly eccentric planets among precisely characterized mini-Neptunes. Based on comparisons to other similar eccentric systems, we find a likely scenario for TOI-757 b's formation to be high eccentricity migration due to a distant outer companion. We additionally propose the possibility of a more intrinsic explanation for the high eccentricity due to star-star interactions during the earlier epoch of the Galactic disc formation, given the low metallicity and older age of TOI-757.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 26