JWST imaging of the closest globular clusters -- IV. Chemistry, luminosity, and mass functions of the lowest-mass members in the NIRISS parallel fields

Autor: Libralato, M., Gerasimov, R., Bedin, L., Anderson, J., Apai, D., Bellini, A., Burgasser, A. J., Griggio, M., Nardiello, D., Salaris, M., Scalco, M., Vesperini, E.

We present observations of the two closest globular clusters, NGC 6121 and NGC 6397, taken with the NIRISS detector of JWST. The combination of our new JWST data with archival Hubble Space Telescope (HST) images allows us to compute proper motions, d

Externí odkaz: http://arxiv.org/abs/2409.06774

JWST Imaging of the Closest Globular Clusters -- III. Multiple Populations along the low-mass Main Sequence stars of NGC 6397

Autor: Scalco, M., Libralato, M., Gerasimov, R., Bedin, L. R., Vesperini, E., Nardiello, D., Bellini, A., Griggio, M., Apai, D., Salaris, M., Burgasser, A., Anderson, J.

Thanks to its exceptional near-infrared photometry, JWST can effectively contribute to the discovery, characterization, and understanding of multiple stellar populations in globular clusters, especially at low masses where the Hubble Space Telescope

Externí odkaz: http://arxiv.org/abs/2405.01635

HST astrometry of the closest Brown Dwarfs -- II. Improved parameters and constraints on a third body

Autor: Bedin, L. R., Dietrich, J., Burgasser, A. J., Apai, D., Libralato, M., Griggio, M., Fontanive, C., Pourbaix, D.

Located at less than 2pc away, Luhman16AB (WISE.J104915.57-531906.1) is the closest pair of brown dwarfs and third closest `stellar' system to Earth. An exoplanet candidate in the Luhman16 binary system was reported in 2017 based on a weak astrometri

Externí odkaz: http://arxiv.org/abs/2403.08865

A super-Earth and a mini-Neptune near the 2:1 MMR straddling the radius valley around the nearby mid-M dwarf TOI-2096

Autor: Pozuelos, F. J., Timmermans, M., Rackham, B. V., Garcia, L. J., Burgasser, A. J., Kane, S. R., Günther, M. N., Stassun, K. G., Van Grootel, V., Dévora-Pajares, M., Luque, R., Edwards, B., Niraula, P., Schanche, N., Wells, R. D., Ducrot, E., Howell, S., Sebastian, D., Barkaoui, K., Waalkes, W., Cadieux, C., Doyon, R., Boyle, R. P., Dietrich, J., Burdanov, A., Delrez, L., Demory, B. -O., de Wit, J., Dransfield, G., Gillon, M., Chew, Y. Gómez Maqueo, Hooton, M. J., Jehin, E., Murray, C. A., Pedersen, P. P., Queloz, D., Thompson, S. J., Triaud, A. H. M. J., Zúñiga-Fernández, S., Collins, K. A., Fausnaugh, M. M., Hedges, C., Hesse, K. M., Jenkins, J. M., Kunimoto, M., Latham, D. W., Shporer, A., Ting, E. B., Torres, G., Amado, P., Rodón, J. R., Rodríguez-López, C., Suárez, J. C., Alonso, R., Benkhaldoun, Z., Berta-Thompson, Z. K., Chinchilla, P., Ghachoui, M., Gómez-Muñoz, M. A., Rebolo, R., Sabin, L., Schroffenegger, U., Furlan, E., Gnilka, C., Lester, K., Scott, N., Aganze, C., Gerasimov, R., Hsu, C., Theissen, C., Apai, D., Chen, W. P., Gabor, P., Henning, T., Mancini, L.

Publikováno v: A&A 672, A70 (2023)

Several planetary formation models have been proposed to explain the observed abundance and variety of compositions of super-Earths and mini-Neptunes. In this context, multitransiting systems orbiting low-mass stars whose planets are close to the rad

Externí odkaz: http://arxiv.org/abs/2303.08174

A large sub-Neptune transiting the thick-disk M4V TOI-2406

Autor: Wells, R. D., Rackham, B. V., Schanche, N., Petrucci, R., Chew, Y. Gomez Maqueo, Demory, B. -O., Burgasser, A. J., Burn, R., Pozuelos, F. J., Gunther, M. N., Sabin, L., Schroffenegger, U., Gomez-Munoz, M. A., Stassun, K. G., Van Grootel, V., Howell, S. B., Sebastian, D., Triaud, A. H. M. J., Apai, D., Plauchu-Frayn, I., Guerrero, C. A., Guillen, P. F., Landa, A., Melgoza, G., Montalvo, F., Serrano, H., Riesgo, H., Barkaoui, K., Bixel, A., Burdanov, A., Chen, W. P., Chinchilla, P., Collins, K. A., Daylan, T., de Wit, J., Delrez, L., Devora-Pajares, M., Dietrich, J., Dransfield, G., Ducrot, E., Fausnaugh, M., Furlan, E., Gabor, P., Gan, T., Garcia, L., Ghachoui, M., Giacalone, S., Gibbs, A. B., Gillon, M., Gnilka, C., Gore, R., Guerrero, N., Henning, T., Hesse, K., Jehin, E., Jenkins, J. M., Latham, D. W., Lester, K., McCormac, J., Murray, C. A., Niraula, P., Pedersen, P. P., Queloz, D., Ricker, G., Rodriguez, D. R., Schroeder, A., Schwarz, R. P., Scott, N., Seager, S., Theissen, C. A., Thompson, S., Timmermans, M., Twicken, J. D., Winn, J. N.

Publikováno v: A&A 653, A97 (2021)

Large sub-Neptunes are uncommon around the coolest stars in the Galaxy and are rarer still around those that are metal-poor. However, owing to the large planet-to-star radius ratio, these planets are highly suitable for atmospheric study via transmis

Externí odkaz: http://arxiv.org/abs/2107.14125