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A second planet transiting LTT 1445A and a determination of the masses of both worlds
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dc.contributor.author | Winters, Jennifer G. | |
dc.contributor.author | Cloutier, Ryan | |
dc.contributor.author | Medina, Amber A. | |
dc.contributor.author | Irwin, Jonathan M. | |
dc.contributor.author | Charbonneau, David | |
dc.contributor.author | Astudillo-Defru, Nicola | |
dc.contributor.author | Bonfils, Xavier | |
dc.contributor.author | Howard, Andrew W. | |
dc.contributor.author | Isaacson, Howard | |
dc.contributor.author | Bean, Jacob L. | |
dc.contributor.author | Seifahrt, Andreas | |
dc.contributor.author | Teske, Johanna K. | |
dc.contributor.author | Eastman, Jason D. | |
dc.contributor.author | Twicken, Joseph D. | |
dc.contributor.author | Collins, Karen A. | |
dc.contributor.author | Jensen, Eric L. N. | |
dc.contributor.author | Quinn, Samuel N. | |
dc.contributor.author | Payne, Matthew J. | |
dc.contributor.author | Kristiansen, Martti H. | |
dc.contributor.author | Spencer, Alton | |
dc.contributor.author | Vanderburg, Andrew | |
dc.contributor.author | Zechmeister, Mathias | |
dc.contributor.author | Weiss, Lauren M. | |
dc.contributor.author | Wang, Sharon Xuesong | |
dc.contributor.author | Wang, Gavin | |
dc.contributor.author | Udry, Stéphane | |
dc.contributor.author | Terentev, Ivan A. | |
dc.contributor.author | Stürmer, Julian | |
dc.contributor.author | Stefánsson, Gudmundur | |
dc.contributor.author | Shporer, Avi | |
dc.contributor.author | Shectman, Stephen | |
dc.contributor.author | Sefako, Ramotholo | |
dc.contributor.author | Schwengeler, Hans Martin | |
dc.contributor.author | Schwarz, Richard P. | |
dc.contributor.author | Scarsdale, Nicholas | |
dc.contributor.author | Rubenzahl, Ryan A. | |
dc.contributor.author | Roy, Arpita | |
dc.contributor.author | Rosenthal, Lee J. | |
dc.contributor.author | Robertson, Paul | |
dc.contributor.author | Petigura, Erik A. | |
dc.contributor.author | Pepe, Francesco | |
dc.contributor.author | Omohundro, Mark | |
dc.contributor.author | Murphy, Joseph M. Akana | |
dc.contributor.author | Murgas, Felipe | |
dc.contributor.author | Močnik, Teo | |
dc.contributor.author | Montet, Benjamin T. | |
dc.contributor.author | Mennickent, Ronald | |
dc.contributor.author | Mayo, Andrew W. | |
dc.contributor.author | Massey, Bob | |
dc.contributor.author | Lubin, Jack | |
dc.contributor.author | Lovis, Christophe | |
dc.contributor.author | Lewin, Pablo | |
dc.contributor.author | Kasper, David | |
dc.contributor.author | Kane, Stephen R. | |
dc.contributor.author | Jenkins, Jon M. | |
dc.contributor.author | Huber, Daniel | |
dc.contributor.author | Horne, Keith | |
dc.contributor.author | Hill, Michelle L. | |
dc.contributor.author | Gorrini, Paula | |
dc.contributor.author | Giacalone, Steven | |
dc.contributor.author | Fulton, Benjamin | |
dc.contributor.author | Forveille, Thierry | |
dc.contributor.author | Figueira, Pedro | |
dc.contributor.author | Fetherolf, Tara | |
dc.contributor.author | Dressing, Courtney | |
dc.contributor.author | Díaz, Rodrigo F. | |
dc.contributor.author | Delfosse, Xavier | |
dc.contributor.author | Dalba, Paul A. | |
dc.contributor.author | Dai, Fei | |
dc.contributor.author | Cortés, C. C. | |
dc.contributor.author | Crossfield, Ian J. M. | |
dc.contributor.author | Crane, Jeffrey D. | |
dc.contributor.author | Conti, Dennis M. | |
dc.contributor.author | Collins, Kevin I. | |
dc.contributor.author | Chontos, Ashley | |
dc.contributor.author | Butler, R. Paul | |
dc.contributor.author | Brown, Peyton | |
dc.contributor.author | Brady, Madison | |
dc.contributor.author | Behmard, Aida | |
dc.contributor.author | Beard, Corey | |
dc.contributor.author | Batalha, Natalie M. | |
dc.contributor.author | Almenara, Jose-Manuel | |
dc.date.accessioned | 2022-03-24T17:34:26Z | |
dc.date.available | 2022-03-24T17:34:26Z | |
dc.date.issued | 2022-04-01 | |
dc.identifier | 278394234 | |
dc.identifier | 9eaf213b-9807-48e3-8933-91d9fa9ebda9 | |
dc.identifier | 85126658783 | |
dc.identifier | 000768522900001 | |
dc.identifier.citation | Winters , J G , Cloutier , R , Medina , A A , Irwin , J M , Charbonneau , D , Astudillo-Defru , N , Bonfils , X , Howard , A W , Isaacson , H , Bean , J L , Seifahrt , A , Teske , J K , Eastman , J D , Twicken , J D , Collins , K A , Jensen , E L N , Quinn , S N , Payne , M J , Kristiansen , M H , Spencer , A , Vanderburg , A , Zechmeister , M , Weiss , L M , Wang , S X , Wang , G , Udry , S , Terentev , I A , Stürmer , J , Stefánsson , G , Shporer , A , Shectman , S , Sefako , R , Schwengeler , H M , Schwarz , R P , Scarsdale , N , Rubenzahl , R A , Roy , A , Rosenthal , L J , Robertson , P , Petigura , E A , Pepe , F , Omohundro , M , Murphy , J M A , Murgas , F , Močnik , T , Montet , B T , Mennickent , R , Mayo , A W , Massey , B , Lubin , J , Lovis , C , Lewin , P , Kasper , D , Kane , S R , Jenkins , J M , Huber , D , Horne , K , Hill , M L , Gorrini , P , Giacalone , S , Fulton , B , Forveille , T , Figueira , P , Fetherolf , T , Dressing , C , Díaz , R F , Delfosse , X , Dalba , P A , Dai , F , Cortés , C C , Crossfield , I J M , Crane , J D , Conti , D M , Collins , K I , Chontos , A , Butler , R P , Brown , P , Brady , M , Behmard , A , Beard , C , Batalha , N M & Almenara , J-M 2022 , ' A second planet transiting LTT 1445A and a determination of the masses of both worlds ' , Astronomical Journal , vol. 163 , no. 4 , 168 . https://doi.org/10.3847/1538-3881/ac50a9 | en |
dc.identifier.issn | 0004-6256 | |
dc.identifier.other | RIS: urn:6A27543DB568082B8D41261FE708C25D | |
dc.identifier.uri | https://hdl.handle.net/10023/25100 | |
dc.description | K.H. acknowledges support from STFC grant ST/R000824/1. | en |
dc.description.abstract | LTT 1445 is a hierarchical triple M-dwarf star system located at a distance of 6.86 pc. The primary star LTT 1445A (0.257 M⊙) is known to host the transiting planet LTT 1445Ab with an orbital period of 5.36 days, making it the second-closest known transiting exoplanet system, and the closest one for which the host is an M dwarf. Using Transiting Exoplanet Survey Satellite data, we present the discovery of a second planet in the LTT 1445 system, with an orbital period of 3.12 days. We combine radial-velocity measurements obtained from the five spectrographs, Echelle Spectrograph for Rocky Exoplanets and Stable Spectroscopic Observations, High Accuracy Radial Velocity Planet Searcher, High-Resolution Echelle Spectrometer, MAROON-X, and Planet Finder Spectrograph to establish that the new world also orbits LTT 1445A. We determine the mass and radius of LTT 1445Ab to be 2.87 ± 0.25 M⊕ and 1.304-0.060+0.067 R⊕, consistent with an Earth-like composition. For the newly discovered LTT 1445Ac, we measure a mass of 1.54-0.19+0.20 M⊕ and a minimum radius of 1.15 R⊕, but we cannot determine the radius directly as the signal-to-noise ratio of our light curve permits both grazing and nongrazing configurations. Using MEarth photometry and ground-based spectroscopy, we establish that star C (0.161 M⊙) is likely the source of the 1.4 day rotation period, and star B (0.215 M⊙) has a likely rotation period of 6.7 days. We estimate a probable rotation period of 85 days for LTT 1445A. Thus, this triple M-dwarf system appears to be in a special evolutionary stage where the most massive M dwarf has spun down, the intermediate mass M dwarf is in the process of spinning down, while the least massive stellar component has not yet begun to spin down. | |
dc.format.extent | 18 | |
dc.format.extent | 19250485 | |
dc.language.iso | eng | |
dc.relation.ispartof | Astronomical Journal | en |
dc.subject | QC Physics | en |
dc.subject | QB Astronomy | en |
dc.subject | 3rd-DAS | en |
dc.subject | MCC | en |
dc.subject.lcc | QC | en |
dc.subject.lcc | QB | en |
dc.title | A second planet transiting LTT 1445A and a determination of the masses of both worlds | en |
dc.type | Journal article | en |
dc.contributor.sponsor | Science & Technology Facilities Council | en |
dc.contributor.institution | University of St Andrews. School of Physics and Astronomy | en |
dc.contributor.institution | University of St Andrews. St Andrews Centre for Exoplanet Science | en |
dc.identifier.doi | 10.3847/1538-3881/ac50a9 | |
dc.description.status | Peer reviewed | en |
dc.identifier.grantnumber | ST/R00824/1 | en |
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