Details

Autor(en) / Beteiligte

• Cadieux, Charles
• Doyon, René
• Plotnykov, Mykhaylo
• Hébrard, Guillaume
• Jahandar, Farbod
• Artigau, Étienne
• Valencia, Diana
• Cook, Neil J.
• Martioli, Eder
• Vandal, Thomas
• Donati, Jean-François
• Cloutier, Ryan
• Narita, Norio
• Fukui, Akihiko
• Hirano, Teruyuki
• Bouchy, François
• Cowan, Nicolas B.
• Gonzales, Erica J.
• Ciardi, David R.
• Stassun, Keivan G.
• Arnold, Luc
• Benneke, Björn
• Boisse, Isabelle
• Bonfils, Xavier
• Carmona, Andrés
• Cortés-Zuleta, Pía
• Delfosse, Xavier
• Forveille, Thierry
• Fouqué, Pascal
• da Silva, João Gomes
• Jenkins, Jon M.
• Kiefer, Flavien
• Kóspál, Ágnes
• Lafrenière, David
• Martins, Jorge H. C.
• Moutou, Claire
• do Nascimento, J.-D.
• Ould-Elhkim, Merwan
• Pelletier, Stefan
• Twicken, Joseph D.
• Bouma, Luke G.
• Cartwright, Scott
• Darveau-Bernier, Antoine
• Grankin, Konstantin
• Ikoma, Masahiro
• Kagetani, Taiki
• Kawauchi, Kiyoe
• Kodama, Takanori
• Kotani, Takayuki
• Latham, David W.
• Menou, Kristen
• Ricker, George
• Seager, Sara
• Tamura, Motohide
• Vanderspek, Roland
• Watanabe, Noriharu

Titel

TOI-1452 b: SPIRou and TESS Reveal a Super-Earth in a Temperate Orbit Transiting an M4 Dwarf

Ist Teil von

• The Astronomical journal, 2022-09, Vol.164 (3), p.96

Ort / Verlag

Madison: The American Astronomical Society

Erscheinungsjahr

2022

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Abstract Exploring the properties of exoplanets near or inside the radius valley provides insight on the transition from the rocky super-Earths to the larger, hydrogen-rich atmosphere mini-Neptunes. Here, we report the discovery of TOI-1452b, a transiting super-Earth ( R p = 1.67 ± 0.07 R ⊕ ) in an 11.1 day temperate orbit ( T eq = 326 ± 7 K) around the primary member ( H = 10.0, T eff = 3185 ± 50 K) of a nearby visual-binary M dwarf. The transits were first detected by the Transiting Exoplanet Survey Satellite, then successfully isolated between the two 3.″2 companions with ground-based photometry from the Observatoire du Mont-Mégantic and MuSCAT3. The planetary nature of TOI-1452b was established through high-precision velocimetry with the near-infrared SPIRou spectropolarimeter as part of the ongoing SPIRou Legacy Survey. The measured planetary mass (4.8 ± 1.3 M ⊕ ) and inferred bulk density ( 5.6 − 1.6 + 1.8 g cm −3 ) is suggestive of a rocky core surrounded by a volatile-rich envelope. More quantitatively, the mass and radius of TOI-1452b, combined with the stellar abundance of refractory elements (Fe, Mg, and Si) measured by SPIRou, is consistent with a core-mass fraction of 18% ± 6% and a water-mass fraction of 22 − 13 + 21 %. The water world candidate TOI-1452b is a prime target for future atmospheric characterization with JWST, featuring a transmission spectroscopy metric similar to other well-known temperate small planets such as LHS 1140b and K2-18 b. The system is located near Webb’s northern continuous viewing zone, implying that is can be followed at almost any moment of the year.