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A Second Planet Transiting LTT 1445A and a Determination of the Masses of Both Worlds
- Source :
- 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, 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, Stuermer, J, Stefansson, 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, Mocnik, 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, Diaz, R F, Delfosse, X, Dalba, P A, Dai, F, Cortes, C C, Crossfield, I J M, Crane, J D, Conti, D M, Collins, K, 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
- Publication Year :
- 2022
- Publisher :
- American Astronomical Society, 2022.
-
Abstract
- LTT 1445 is a hierarchical triple M-dwarf star system located at a distance of 6.86 parsecs. The primary star LTT 1445A (0.257 M_Sun) is known to host the transiting planet LTT 1445Ab with an orbital period of 5.4 days, making it the second closest known transiting exoplanet system, and the closest one for which the host is an M dwarf. Using TESS data, we present the discovery of a second planet in the LTT 1445 system, with an orbital period of 3.1 days. We combine radial velocity measurements obtained from the five spectrographs ESPRESSO, HARPS, HIRES, MAROON-X, and PFS 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_Earth and 1.304^{+0.067}_{-0.060} R_Earth, consistent with an Earth-like composition. For the newly discovered LTT 1445Ac, we measure a mass of 1.54^{+0.20}_{-0.19} M_Earth and a minimum radius of 1.15 R_Earth, but we cannot determine the radius directly as the signal-to-noise of our light curve permits both grazing and non-grazing configurations. Using MEarth photometry and ground-based spectroscopy, we establish that star C (0.161 M_Sun) is likely the source of the 1.4-day rotation period, and star B (0.215 M_Sun) 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.<br />Comment: Accepted to the Astronomical Journal. 4 tables, 10 figures; RV table available upon request
- Subjects :
- STELLAR ACTIVITY
FOS: Physical sciences
SUPER-EARTH
Astrophysics::Cosmology and Extragalactic Astrophysics
EARTH-SIZED PLANET
HARPS
NEARBY
QB Astronomy
Astrophysics::Solar and Stellar Astrophysics
QC
TERRESTRIAL PLANET
Solar and Stellar Astrophysics (astro-ph.SR)
Astrophysics::Galaxy Astrophysics
QB
MCC
Earth and Planetary Astrophysics (astro-ph.EP)
RADIAL-VELOCITIES
ERROR-CORRECTION
M DWARFS
Astronomy and Astrophysics
3rd-DAS
QC Physics
Astrophysics - Solar and Stellar Astrophysics
Space and Planetary Science
Astrophysics::Earth and Planetary Astrophysics
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
SYSTEM
Astrophysics - Earth and Planetary Astrophysics
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- 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, 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, Stuermer, J, Stefansson, 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, Mocnik, 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, Diaz, R F, Delfosse, X, Dalba, P A, Dai, F, Cortes, C C, Crossfield, I J M, Crane, J D, Conti, D M, Collins, K, 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
- Accession number :
- edsair.doi.dedup.....a670cd3935b41769154fe8c069a0d229
- Full Text :
- https://doi.org/10.3847/1538-3881/ac50a9