Hot planets around cool stars - two short-period mini-Neptunes transiting the late K-dwarf TOI-1260
| Autor: | Grzegorz Nowak, Scott McDermott, Eike W. Guenther, Daniele Locci, J. D. Twicken, L. M. Serrano, Keivan G. Stassun, Hannah L. M. Osborne, Martin Paegert, Vincent Van Eylen, M. Fridlund, Enric Palle, P. Guerra, Oscar Barragán, Teriyuki Hirano, George R. Ricker, Rafael Luque, Ilaria Carleo, Alexis M. S. Smith, David W. Latham, Davide Gandolfi, Sascha Grziwa, Elisabeth Matthews, C. E. Brasseur, Roland Vanderspek, Knicole D. Colón, Stephen R. Kane, Steve B. Howell, Seth Redfield, Simon Albrecht, Ian Crossfield, A. M. Levine, E. Goffo, Tianjun Gan, Iskra Georgieva, Samuel N. Quinn, Joshua E. Schlieder, Joshua N. Winn, William D. Cochran, Elise Furlan, Emil Knudstrup, Petr Kabath, Erica J. Gonzales, K. W. F. Lam, Carina M. Persson, Allyson Bieryla, Karen A. Collins, Jon M. Jenkins, Sara Seager, Szilard Csizmadia, Peter Tenenbaum, M. Esposito, N. Scott, Rachel A. Matson, Eric L. N. Jensen, J. Korth, David R. Ciardi, Hans J. Deeg, John H. Livingston |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
TOI-1260b
Atmospheres Astrophysics photometric [techniques] techniques: photometric Planet stars: low-mass techniques: radial velocities Radial Velocities TOOL Planetary Systems low-mass [stars] individual: TOI-1260b c [planets and satellites] composition [planets and satellites] Physics Earth and Planetary Astrophysics (astro-ph.EP) planets and satellites: atmospheres SPECTROSCOPY planets and satellites: composition radial velocities [techniques] Planets and Satellites EXOPLANETS Photoevaporation Exoplanet Radial velocity Astrophysics::Earth and Planetary Astrophysics ATMOSPHERES Composition Dwarf star Metallicity MODELS FOS: Physical sciences SUPER-EARTH Individual MASS Photometric AGE planets and satellites: individual: TOI-1260b Low-Mass planetary systems RADIAL-VELOCITY Astronomy and Astrophysics atmospheres [planets and satellites] Planetary system Stars Techniques M-CIRCLE-PLUS Photometry (astronomy) Space and Planetary Science Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | arXiv Georgieva, I Y, Persson, C M, Barragan, O, Nowak, G, Fridlund, M, Locci, D, Palle, E, Luque, R, Carleo, I, Gandolfi, D, Kane, S R, Korth, J, Stassun, K G, Livingston, J, Matthews, E C, Collins, K A, Howell, S B, Serrano, L M, Albrecht, S, Bieryla, A, Brasseur, C E, Ciardi, D, Cochran, W D, Colon, K D, Crossfield, I J M, Csizmadia, S, Deeg, H J, Esposito, M, Furlan, E, Gan, T, Goffo, E, Gonzales, E, Grziwa, S, Guenther, E W, Guerra, P, Hirano, T, Jenkins, J M, Jensen, E L N, Kabath, P, Knudstrup, E, Lam, K W F, Latham, D W, Levine, A M, Matson, R A, McDermott, S, Osborne, H L M, Paegert, M, Quinn, S N, Redfield, S, Ricker, G R, Schlieder, J E, Scott, N J, Seager, S, Smith, A M S, Tenenbaum, P, Twicken, J D, Vanderspek, R, Van Eylen, V & Winn, J N 2021, ' Hot planets around cool stars-two short-period mini-Neptunes transiting the late K-dwarf TOI-1260 ', Monthly Notices of the Royal Astronomical Society, vol. 505, no. 4, pp. 4684-4701 . https://doi.org/10.1093/mnras/stab1464 Monthly Notices of the Royal Astronomical Society, 505(4), 4684-4701 |
| DOI: | 10.1093/mnras/stab1464 |
| Popis: | We present the discovery and characterization of two sub-Neptunes in close orbits, as well as a tentative outer planet of a similar size, orbiting TOI-1260 – a low metallicity K6 V dwarf star. Photometry from Transiting Exoplanet Survey Satellite(TESS) yields radii of Rb = 2.33 ± 0.10 and Rc = 2.82 ± 0.15 R⊕, and periods of 3.13 and 7.49 d for TOI-1260 b and TOI-1260 c, respectively. We combined the TESS data with a series of ground-based follow-up observations to characterize the planetary system. From HARPS-N high-precision radial velocities we obtain Mb = $8.6 _{ - 1.5 } ^ { + 1.4 }$ and Mc = $11.8 _{ - 3.2 } ^ { + 3.4 }$ M⊕. The star is moderately active with a complex activity pattern, which necessitated the use of Gaussian process regression for both the light-curve detrending and the radial velocity modelling, in the latter case guided by suitable activity indicators. We successfully disentangle the stellar-induced signal from the planetary signals, underlining the importance and usefulness of the Gaussian process approach. We test the system’s stability against atmospheric photoevaporation and find that the TOI-1260 planets are classic examples of the structure and composition ambiguity typical for the 2–3 R⊕ range. |
| Databáze: | OpenAIRE |
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