A detailed analysis of the Gl 486 planetary system

Caballero, J. A.; González-Álvarez, E.; Brady, Madison; Trifonov, T.; Ellis, Tyler G.; Dorn, Caroline; Cifuentes, C.; Molaverdikhani, Karan; Bean, Jacob L.; Boyajian, Tabetha S.; Rodrı́guez, E.; Sanz-Forcada, J.; Osorio, M. R. Zapatero; Abia, C.; Amado, P. J.; Anugu, Narsireddy; Béjar, V. J. S.; Davies, Claire L.; Dubois, Franky; Ennis, Jacob; Espinoza, N.; Farrington, C.; López, A.; Gardner, Tyler; Hatzes, A. P.; Henning, Th.; Herrero, E.; Herrero-Cisneros, E.; Kaminski, A.; Kasper, David C.; Klement, Róbert; Kraus, Stefan; Labdon, Aaron; Lanthermann, Cyprien; Bouquin, J.-B. Le; González, Marta; Luque, R.; Mann, Andrew W.; Marfil, E.; Montes, D.; Morales, J. C.; Πάλλη, Ε.; Pedraz, S.; Quirrenbach, A.; Reffert, S.; Reiners, A.; Ribas, I.; Rodríguez‐López, C.; Schaefer, Gail H.; Schweitzer, A.; Seifahrt, Andreas; Setterholm, Benjamin R.; Shan, Yutong; Shulyak, D.; Solano, E.; Sreenivas, K. R.; Stefánsson, Guðmundur; Stuermer, J.; Tabernero, H. M.; Tal-Or, L.; Brummelaar, T. ten; Vanaverbeke, Sigfried; Braun, Kaspar von; Youngblood, Allison; Zechmeister, M.

doi:10.1051/0004-6361/202243548

Cited by 22 publications

(11 citation statements)

References 359 publications

(382 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A6 shows the ASAS-SN data for four stars for which significant (𝑝 < 0.01) signals with the same period appear in both 𝑔-and 𝑉-band photometry. In the case of GJ 486, the recovered signal at 13.7 days differs markedly from the value of 49.9 ± 5.5 days published by Caballero et al (2022).…”

Section: Discussioncontrasting

confidence: 74%

See 1 more Smart Citation

The TIME Table: Rotation and Ages of Cool Exoplanet Host Stars

Gaidos¹,

Claytor²,

Dungee³

et al. 2023

Preprint

View full text Add to dashboard Cite

Age is a stellar parameter that is both fundamental and difficult to determine. Among middleaged M dwarfs, the most prolific hosts of close-in and detectable exoplanets, gyrochronology is the most promising method to assign ages, but requires calibration by rotation-temperature sequences (gyrochrones) in clusters of known ages. We curated a catalog of 249 late Kand M-type (𝑇 eff =3200-4200K) exoplanet host stars with established rotation periods, and applied empirical, temperature-dependent rotation-age relations based on relevant published gyrochrones, including one derived from observations of the 4 Gyr-old open cluster M67. We estimated ages for 227 of these stars, and upper limits for 8 others, excluding 14 which are too rapidly rotating or are otherwise outside the valid parameter range of our gyrochronology. We estimated uncertainties based on observed scatter in rotation periods in young clusters, error in the gyrochrones, and uncertainties in temperature and non-solar metallicity. For those stars with measured metallicities, we provide but do not incorporate a correction for the effects of deviation from solar-metallicity. The age distribution of our sample declines to near zero at 10 Gyr, the age of the Galactic disk, with the handful of outliers explainable by large uncertainties. Continued addition or extension of cluster rotation sequences to more thoroughly calibrate the gyrochronology in time and temperature space, more precise and robust measurement of rotation periods, and more accurate stellar parameter measurements will enable continued improvements in the age estimates of these important exoplanet host stars.

show abstract

Section: Discussioncontrasting

confidence: 74%

“…A6. In the case of GJ 486, the detected signals at 13.7 days differ markedly from the published 𝑃 rot of 49.9 ± 5.5 days (Caballero et al 2022) (which we retain).…”

Section: Sources Of Rotation Periodscontrasting

confidence: 61%

The TIME Table: Rotation and Ages of Cool Exoplanet Host Stars

Gaidos¹,

Claytor²,

Dungee³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Our constraints on GJ 486b's atmospheric composition (Section 6.2) can inform these future JWST observations. Caballero et al (2022) show that a H 2 /He-dominated atmosphere can be readily by JWST with transits. However, we can confidently rule out to 5σ a clear H 2 /He-dominated atmosphere with H 2 O, CH 4 , NH 3 , HCN, CO 2 , and CO at solar abundances.…”

Section: Clouds and Hazesmentioning

confidence: 86%

“…Previous studies have surmised that a wide range of atmospheric compositions are possible for GJ 486b. Caballero et al (2022) refined GJ 486b's mass and radius, and presented a suite of interior and atmospheric models. They showed that possible atmospheres include: (i) a H/He-dominated atmosphere with solar abundances; (ii) a H/He atmosphere with enhanced metallicity (e.g., 100x solar abundances); (iii) a H 2 O-dominated atmosphere; (iv) a CO 2 -dominated atmosphere; or (v) bare rock with a tenuous atmosphere, possibly containing Na.…”

Section: Introductionmentioning

confidence: 99%

High-resolution Transmission Spectroscopy of the Terrestrial Exoplanet GJ 486b

Ridden-Harper

Nugroho

Flagg

et al. 2023

View full text Add to dashboard Cite

Terrestrial exoplanets orbiting M-dwarf stars are promising targets for transmission spectroscopy with existing or near-future instrumentation. The atmospheric composition of such rocky planets remains an open question, especially given the high X-ray and ultraviolet flux from their host M dwarfs that can drive atmospheric escape. The 1.3 R ⊕ exoplanet GJ 486b (T eq ∼ 700 K), orbiting an M3.5 star, is expected to have one of the strongest transmission spectroscopy signals among known terrestrial exoplanets. We observed three transits of GJ 486b using three different high-resolution spectrographs: IRD on Subaru, IGRINS on Gemini-South, and SPIRou on the Canada–France–Hawai’i Telescope. We searched for atmospheric absorption from a wide variety of molecular species via the cross-correlation method, but did not detect any robust atmospheric signals. Nevertheless, our observations are sufficiently sensitive to rule out several clear atmospheric scenarios via injection and recovery tests, and extend comparative exoplanetology into the terrestrial regime. Our results suggest that GJ 486b does not possess a clear H2/He-dominated atmosphere, nor a clear 100% water-vapor atmosphere. Other secondary atmospheres with high mean molecular weights or H2/He-dominated atmospheres with clouds remain possible. Our findings provide further evidence suggesting that terrestrial planets orbiting M-dwarf stars may experience significant atmospheric loss.

show abstract

“…Simultaneous observations in two wavelength ranges help to distinguish between a planetary signal and stellar activity. Both spectrographs are designed to perform high-accuracy radial velocity measurements with a long-term stability of ∼1 m s −1 , which allows the detection of 2 M e planets orbiting in the habitable zone of M5 V stars (Trifonov et al 2018;Luque et al 2019;Morales et al 2019;Zechmeister et al 2019;Caballero et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Photometric Calibrations of M-dwarf Metallicity with Markov Chain Monte Carlo and Bayesian Inference

Duque-Arribas

Montes

Tabernero

et al. 2023

ApJ

Self Cite

View full text Add to dashboard Cite

Knowledge of stellar atmospheric parameters (T eff, log g , [Fe/H]) of M dwarfs can be used to constrain both theoretical stellar models and Galactic chemical evolutionary models, and guide exoplanet searches, but their determination is difficult due to the complexity of the spectra of their cool atmospheres. In our ongoing effort to characterize M dwarfs, and in particular their chemical composition, we carried out multiband photometric calibrations of metallicity for early- and intermediate-type M dwarfs. The third Gaia data release provides high-precision astrometry and three-band photometry. This information, combined with the 2MASS and CatWISE2020 infrared photometric surveys and a sample of 4919 M dwarfs with metallicity values determined with high-resolution spectroscopy by The Cannon and APOGEE spectra, allowed us to study the effect of the metallicity in color–color and color–magnitude diagrams. We divided this sample into two subsamples: we used 1000 stars to train the calibrations with Bayesian statistics and Markov Chain Monte Carlo techniques, and the remaining 3919 stars to check the accuracy of the estimations. We derived several photometric calibrations of metallicity applicable to M dwarfs in the range of −0.45 ≤ [Fe/H] ≤ + 0.45 dex and spectral types down to M5.0 V that yield uncertainties down to the 0.10 dex level. Lastly, we compared our results with other photometric estimations published in the literature for an additional sample of 46 M dwarfs in wide binary systems with FGK-type primary stars and found a great predictive performance.

show abstract

A detailed analysis of the Gl 486 planetary system

Cited by 22 publications

References 359 publications

The TIME Table: Rotation and Ages of Cool Exoplanet Host Stars

The TIME Table: Rotation and Ages of Cool Exoplanet Host Stars

High-resolution Transmission Spectroscopy of the Terrestrial Exoplanet GJ 486b

Photometric Calibrations of M-dwarf Metallicity with Markov Chain Monte Carlo and Bayesian Inference

Contact Info

Product

Resources

About