학술논문
TOI-1452 b: SPIRou and TESS reveal a super-Earth in a temperate orbit transiting an M4 dwarf
Document Type
Working Paper
Author
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; Nascimento Jr., J. -D. do; 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
Source
AJ, 164, 96 (2022)
Subject
Language
Abstract
Exploring the properties of exoplanets near or inside the radius valley provides insights on the transition from the rocky super-Earths to the larger, hydrogen-rich atmosphere mini-Neptunes. Here, we report the discovery of TOI-1452 b, a transiting super-Earth ($R_{\rm p} = 1.67 \pm 0.07$ R$_{\oplus}$) in an 11.1--day temperate orbit ($T_{\rm eq} = 326 \pm 7$ K) around the primary member ($H = 10.0$, $T_{\rm eff} = 3185 \pm 50$ K) of a nearby visual binary M dwarf. The transits were first detected by TESS, then successfully isolated between the two $3.2^{\prime\prime}$ companions with ground-based photometry from OMM and MuSCAT3. The planetary nature of TOI-1452 b was established through high-precision velocimetry with the near-infrared SPIRou spectropolarimeter as part of the ongoing SPIRou Legacy Survey. The measured planetary mass ($4.8 \pm 1.3$ M$_{\oplus}$) and inferred bulk density ($5.6^{+1.8}_{-1.6}$ g/cm$^3$) is suggestive of a rocky core surrounded by a volatile-rich envelope. More quantitatively, the mass and radius of TOI-1452 b, combined with the stellar abundance of refractory elements (Fe, Mg and Si) measured by SPIRou, is consistent with a core mass fraction of $18\pm6$ % and a water mass fraction of $22^{+21}_{-13}$%. The water world candidate TOI-1452 b 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 1140 b 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.
Comment: Published in The Astronomical Journal
Comment: Published in The Astronomical Journal