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

Alqasim, A and Grieves, N and Rosário, N M and Gandolfi, D and Livingston, J H and Sousa, S and Collins, K A and Teske, J K and Fridlund, M and Egger, J A and Cabrera, J and Hellier, C and Lanza, A F and Van Eylen, V and Bouchy, F and Oelkers, R J and Srdoc, G and Shectman, S and Günther, M and Goffo, E and Wilson, T and Serrano, L M and Brandeker, A and Wang, S X and Heitzmann, A and Bonfanti, A and Fossati, L and Alibert, Y and Delrez, L and Sefako, R and Barros, S and Collins, K I and Demangeon, O D S and Albrecht, S H and Alonso, R and Asquier, J and Barczy, T and Barrado, D and Baumjohann, W and Beck, T and Benz, W and Billot, N and Borsato, L and Broeg, C and Bryant, E M and Butler, R P and Cochran, W D and Cameron, A Collier and Correia, A C M and Crane, J D and Csizmadia, Sz and Cubillos, P E and Davies, M B and Daylan, T and Deleuil, M and Deline, A and Demory, B -O and Derekas, A and Edwards, B and Ehrenreich, D and Erikson, A and Essack, Z and Fortier, A and Gazeas, K and Gillon, M and Gudel, M and Hasiba, J and Hatzes, A P and Helling, Ch and Hirano, T and Howell, S B and Hoyer, S and Isaak, K G and Jenkins, J M and Kanodia, S and Kiss, L L and Korth, J and Lam, K W F and Laskar, J and Lecavelier des Etangs, A. and Lendl, M and Lund, M B and Luque, R and Mann, A W and Magrin, D and Maxted, P F L and Mordasini, C and Narita, N and Nascimbeni, V and Nowak, G and Olofsson, G and Osborn, H P and Osborne, H L M and Osip, D and Ottensamer, R and Pagano, I and Palle, E and Peter, G and Piotto, G and Pollacco, D and Queloz, D and Ragazzoni, R and Rando, N and Rauer, H and Redfield, S and Ribas, I and Rice, M and Ricker, G R and Rieder, M and Salmon, S and Santos, N C and Scandariato, G and Seager, S and Segransan, D and Shporer, A and Simon, A E and Smith, A M S and Stalport, M and Szabo, Gy M and Thompson, I and Twicken, J D and Udry, S and Vanderspek, R and Van Grootel, V and Venturini, J and Villaver, E and Villaseñor, J and Viotto, V and Walter, I and Walton, N A and Winn, J N and Yee, S W (2024) TOI–757 b: an eccentric transiting mini–Neptune on a 17.5–d orbit. Monthly Notices of the Royal Astronomical Society, 533 (1), pp. 1-26. Oxford University Press. doi: 10.1093/mnras/stae1767. ISSN 0035-8711.

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Official URL: https://dx.doi.org/10.1093/mnras/stae1767

Abstract

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 Rp=2.5±0.1R⊕ and a mass of Mp=10.5+2.2−2.1M⊕, implying a bulk density of ρp=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+0.08−0.07, 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.

Item URL in elib:https://elib.dlr.de/206783/
Document Type:Article
Title:TOI–757 b: an eccentric transiting mini–Neptune on a 17.5–d orbit
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Alqasim, AUNSPECIFIEDhttps://orcid.org/0000-0001-5102-5505UNSPECIFIED
Grieves, NUNSPECIFIEDhttps://orcid.org/0000-0001-8105-0373UNSPECIFIED
Rosário, N MUNSPECIFIEDhttps://orcid.org/0000-0002-8588-6730UNSPECIFIED
Gandolfi, DUNSPECIFIEDhttps://orcid.org/0000-0001-8627-9628UNSPECIFIED
Livingston, J HUNSPECIFIEDhttps://orcid.org/0000-0002-4881-3620UNSPECIFIED
Sousa, SUNSPECIFIEDhttps://orcid.org/0000-0001-9047-2965UNSPECIFIED
Collins, K AUNSPECIFIEDhttps://orcid.org/0000-0001-6588-9574UNSPECIFIED
Teske, J KUNSPECIFIEDhttps://orcid.org/0009-0008-2801-5040UNSPECIFIED
Fridlund, MUNSPECIFIEDhttps://orcid.org/0000-0002-0855-8426UNSPECIFIED
Egger, J AUNSPECIFIEDhttps://orcid.org/0000-0003-1628-4231UNSPECIFIED
Cabrera, JUNSPECIFIEDhttps://orcid.org/0000-0001-6653-5487UNSPECIFIED
Hellier, CUNSPECIFIEDhttps://orcid.org/0000-0002-3439-1439UNSPECIFIED
Lanza, A FUNSPECIFIEDhttps://orcid.org/0000-0001-5928-7251UNSPECIFIED
Van Eylen, VUNSPECIFIEDhttps://orcid.org/0000-0001-5542-8870UNSPECIFIED
Bouchy, FUNSPECIFIEDhttps://orcid.org/0000-0002-7613-393XUNSPECIFIED
Oelkers, R JUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Srdoc, GUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Shectman, SUNSPECIFIEDhttps://orcid.org/0000-0002-8681-6136UNSPECIFIED
Günther, MUNSPECIFIEDhttps://orcid.org/0000-0002-3164-9086UNSPECIFIED
Goffo, EUNSPECIFIEDhttps://orcid.org/0000-0001-9670-961XUNSPECIFIED
Wilson, TUNSPECIFIEDhttps://orcid.org/0000-0001-8749-1962UNSPECIFIED
Serrano, L MUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Brandeker, AUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wang, S XUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Heitzmann, AUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bonfanti, AUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fossati, LUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Alibert, YUNSPECIFIEDhttps://orcid.org/0000-0002-4644-8818UNSPECIFIED
Delrez, LUNSPECIFIEDhttps://orcid.org/0000-0001-6108-4808UNSPECIFIED
Sefako, RUNSPECIFIEDhttps://orcid.org/0000-0003-3904-6754UNSPECIFIED
Barros, SUNSPECIFIEDhttps://orcid.org/0000-0003-2434-3625UNSPECIFIED
Collins, K IUNSPECIFIEDhttps://orcid.org/0000-0003-2781-3207UNSPECIFIED
Demangeon, O D SUNSPECIFIEDhttps://orcid.org/0000-0001-7918-0355UNSPECIFIED
Albrecht, S HUNSPECIFIEDhttps://orcid.org/0000-0003-1762-8235UNSPECIFIED
Alonso, RUNSPECIFIEDhttps://orcid.org/0000-0001-8462-8126UNSPECIFIED
Asquier, JUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Barczy, TUNSPECIFIEDhttps://orcid.org/0000-0002-7822-4413UNSPECIFIED
Barrado, DUNSPECIFIEDhttps://orcid.org/0000-0002-5971-9242UNSPECIFIED
Baumjohann, WUNSPECIFIEDhttps://orcid.org/0000-0001-6271-0110UNSPECIFIED
Beck, TUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Benz, WUNSPECIFIEDhttps://orcid.org/0000-0001-7896-6479UNSPECIFIED
Billot, NUNSPECIFIEDhttps://orcid.org/0000-0003-3429-3836UNSPECIFIED
Borsato, LUNSPECIFIEDhttps://orcid.org/0000-0003-0066-9268UNSPECIFIED
Broeg, CUNSPECIFIEDhttps://orcid.org/0000-0001-5132-2614UNSPECIFIED
Bryant, E MUNSPECIFIEDhttps://orcid.org/0000-0001-7904-4441UNSPECIFIED
Butler, R PUNSPECIFIEDhttps://orcid.org/0000-0003-1305-3761UNSPECIFIED
Cochran, W DUNSPECIFIEDhttps://orcid.org/0000-0001-9662-3496UNSPECIFIED
Cameron, A CollierUNSPECIFIEDhttps://orcid.org/0000-0002-8863-7828UNSPECIFIED
Correia, A C MUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Crane, J DUNSPECIFIEDhttps://orcid.org/0000-0002-5226-787XUNSPECIFIED
Csizmadia, SzUNSPECIFIEDhttps://orcid.org/0000-0001-6803-9698UNSPECIFIED
Cubillos, P EUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Davies, M BUNSPECIFIEDhttps://orcid.org/0000-0001-6080-1190UNSPECIFIED
Daylan, TUNSPECIFIEDhttps://orcid.org/0000-0002-6939-9211UNSPECIFIED
Deleuil, MUNSPECIFIEDhttps://orcid.org/0000-0001-6036-0225UNSPECIFIED
Deline, AUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Demory, B -OUNSPECIFIEDhttps://orcid.org/0000-0002-9355-5165UNSPECIFIED
Derekas, AUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Edwards, BUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ehrenreich, DUNSPECIFIEDhttps://orcid.org/0000-0001-9704-5405UNSPECIFIED
Erikson, AUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Essack, ZUNSPECIFIEDhttps://orcid.org/0000-0002-2482-0180UNSPECIFIED
Fortier, AUNSPECIFIEDhttps://orcid.org/0000-0001-8450-3374UNSPECIFIED
Gazeas, KUNSPECIFIEDhttps://orcid.org/0000-0002-8855-3923UNSPECIFIED
Gillon, MUNSPECIFIEDhttps://orcid.org/0000-0003-1462-7739UNSPECIFIED
Gudel, MUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hasiba, JUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hatzes, A PUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Helling, ChUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hirano, TUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Howell, S BUNSPECIFIEDhttps://orcid.org/0000-0002-2532-2853UNSPECIFIED
Hoyer, SUNSPECIFIEDhttps://orcid.org/0000-0003-3477-2466UNSPECIFIED
Isaak, K GUNSPECIFIEDhttps://orcid.org/0000-0001-8585-1717UNSPECIFIED
Jenkins, J MUNSPECIFIEDhttps://orcid.org/0000-0002-4715-9460UNSPECIFIED
Kanodia, SUNSPECIFIEDhttps://orcid.org/0000-0001-8401-4300UNSPECIFIED
Kiss, L LUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Korth, JUNSPECIFIEDhttps://orcid.org/0000-0002-0076-6239UNSPECIFIED
Lam, K W FUNSPECIFIEDhttps://orcid.org/0000-0002-9910-6088UNSPECIFIED
Laskar, JUNSPECIFIEDhttps://orcid.org/0000-0003-2634-789XUNSPECIFIED
Lecavelier des Etangs, A.Institut d Astrophysique de Paris, CNRS, UMR 7095 & Sorbonne Universites, UPMC Paris 6, 98 bis bd Arago, 75014 Paris, FranceUNSPECIFIEDUNSPECIFIED
Lendl, MUNSPECIFIEDhttps://orcid.org/0000-0001-9699-1459UNSPECIFIED
Lund, M BUNSPECIFIEDhttps://orcid.org/0000-0003-2527-1598UNSPECIFIED
Luque, RUNSPECIFIEDhttps://orcid.org/0000-0002-4671-2957UNSPECIFIED
Mann, A WUNSPECIFIEDhttps://orcid.org/0000-0003-3654-1602UNSPECIFIED
Magrin, DUNSPECIFIEDhttps://orcid.org/0000-0003-0312-313XUNSPECIFIED
Maxted, P F LUNSPECIFIEDhttps://orcid.org/0000-0003-3794-1317UNSPECIFIED
Mordasini, CUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Narita, NUNSPECIFIEDhttps://orcid.org/0000-0001-8511-2981UNSPECIFIED
Nascimbeni, VUNSPECIFIEDhttps://orcid.org/0000-0001-9770-1214UNSPECIFIED
Nowak, GUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Olofsson, GUNSPECIFIEDhttps://orcid.org/0000-0003-3747-7120UNSPECIFIED
Osborn, H PUNSPECIFIEDhttps://orcid.org/0000-0002-4047-4724UNSPECIFIED
Osborne, H L MUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Osip, DUNSPECIFIEDhttps://orcid.org/0000-0003-0412-9664UNSPECIFIED
Ottensamer, RUNSPECIFIEDhttps://orcid.org/0000-0001-5684-5836UNSPECIFIED
Pagano, IUNSPECIFIEDhttps://orcid.org/0000-0001-9573-4928UNSPECIFIED
Palle, EUNSPECIFIEDhttps://orcid.org/0000-0003-0987-1593UNSPECIFIED
Peter, GUNSPECIFIEDhttps://orcid.org/0000-0001-6101-2513UNSPECIFIED
Piotto, GUNSPECIFIEDhttps://orcid.org/0000-0002-9937-6387UNSPECIFIED
Pollacco, DUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Queloz, DUNSPECIFIEDhttps://orcid.org/0000-0002-3012-0316UNSPECIFIED
Ragazzoni, RUNSPECIFIEDhttps://orcid.org/0000-0002-7697-5555UNSPECIFIED
Rando, NUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rauer, HUNSPECIFIEDhttps://orcid.org/0000-0002-6510-1828UNSPECIFIED
Redfield, SUNSPECIFIEDhttps://orcid.org/0000-0003-3786-3486UNSPECIFIED
Ribas, IUNSPECIFIEDhttps://orcid.org/0000-0002-6689-0312UNSPECIFIED
Rice, MUNSPECIFIEDhttps://orcid.org/0000-0002-7670-670XUNSPECIFIED
Ricker, G RUNSPECIFIEDhttps://orcid.org/0000-0003-2058-6662UNSPECIFIED
Rieder, MUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Salmon, SUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Santos, N CUNSPECIFIEDhttps://orcid.org/0000-0003-4422-2919UNSPECIFIED
Scandariato, GUNSPECIFIEDhttps://orcid.org/0000-0003-2029-0626UNSPECIFIED
Seager, SUNSPECIFIEDhttps://orcid.org/0000-0002-6892-6948UNSPECIFIED
Segransan, DUNSPECIFIEDhttps://orcid.org/0000-0003-2355-8034UNSPECIFIED
Shporer, AUNSPECIFIEDhttps://orcid.org/0000-0002-1836-3120UNSPECIFIED
Simon, A EUNSPECIFIEDhttps://orcid.org/0000-0001-9773-2600UNSPECIFIED
Smith, A M SUNSPECIFIEDhttps://orcid.org/0000-0002-2386-4341UNSPECIFIED
Stalport, MUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Szabo, Gy MUNSPECIFIEDhttps://orcid.org/0000-0002-0606-7930UNSPECIFIED
Thompson, IUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Twicken, J DUNSPECIFIEDhttps://orcid.org/0000-0002-6778-7552UNSPECIFIED
Udry, SUNSPECIFIEDhttps://orcid.org/0000-0001-7576-6236UNSPECIFIED
Vanderspek, RUNSPECIFIEDhttps://orcid.org/0000-0001-6763-6562UNSPECIFIED
Van Grootel, VUNSPECIFIEDhttps://orcid.org/0000-0003-2144-4316UNSPECIFIED
Venturini, JUNSPECIFIEDhttps://orcid.org/0000-0001-9527-2903UNSPECIFIED
Villaver, EUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Villaseñor, JUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Viotto, VUNSPECIFIEDhttps://orcid.org/0000-0001-5700-9565UNSPECIFIED
Walter, IUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Walton, N AUNSPECIFIEDhttps://orcid.org/0000-0003-3983-8778UNSPECIFIED
Winn, J NUNSPECIFIEDhttps://orcid.org/0000-0002-4265-047XUNSPECIFIED
Yee, S WUNSPECIFIEDhttps://orcid.org/0000-0001-7961-3907UNSPECIFIED
Date:1 August 2024
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:533
DOI:10.1093/mnras/stae1767
Page Range:pp. 1-26
Publisher:Oxford University Press
ISSN:0035-8711
Status:Published
Keywords:techniques: photometric – techniques: radial velocities – planets and satellites: composition – planets and satellites: interiors – stars: individual: TOI-757 (TIC 130924120).
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - CHEOPS Science, R - Project CHEOPS
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Institute of Planetary Research > Leitungsbereich PF
Institute of Optical Sensor Systems > Space Instruments
Deposited By: Smith, Dr Alexis M S
Deposited On:11 Oct 2024 12:47
Last Modified:25 Feb 2025 12:38

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