All Outputs (174)

HD 21520 b: a warm sub-Neptune transiting a bright G dwarf (2024)
Journal Article
Nies, M., Mireles, I., Bouchy, F., Dragomir, D., Nicholson, B. A., Eisner, N. L., …Ricker, G. R. (in press). HD 21520 b: a warm sub-Neptune transiting a bright G dwarf. Monthly Notices of the Royal Astronomical Society, https://doi.org/10.1093/mnras/stae2079

We report the discovery and validation of HD 21520 b, a transiting planet found with TESS and orbiting a bright G dwarf (V=9.2, Teff = 5871 ± 62 K, R⋆ = 1.04 ± 0.02 R⊙). HD 21520 b was originally alerted as a system (TOI-4320) consisting of two plane... Read More about HD 21520 b: a warm sub-Neptune transiting a bright G dwarf.

TOI–757 b: an eccentric transiting mini–Neptune on a 17.5–d orbit (2024)
Journal Article
Alqasim, A., Grieves, N., Rosário, N. M., Gandolfi, D., Livingston, J. H., Sousa, S., …Yee, S. W. (2024). TOI–757 b: an eccentric transiting mini–Neptune on a 17.5–d orbit. Monthly Notices of the Royal Astronomical Society, 533(1), 1-26. https://doi.org/10.1093/mnras/stae1767

We report the spectroscopic confirmation and fundamental properties of TOI$-$757 b, a mini$-$Neptune on a 17.5$-$d orbit transiting a bright star ($V\, =\, 9.7$ mag) discovered by the TESS mission. We acquired high$-$precision radial velocity measure... Read More about TOI–757 b: an eccentric transiting mini–Neptune on a 17.5–d orbit.

Early Results from the HUMDRUM Survey: A Small, Earth-mass Planet Orbits TOI-1450A (2024)
Journal Article
Brady, M., Bean, J. L., Seifahrt, A., Kasper, D., Luque, R., Stefánsson, G., …Zambelli, R. (2024). Early Results from the HUMDRUM Survey: A Small, Earth-mass Planet Orbits TOI-1450A. Astronomical Journal, 168(2), Article 67. https://doi.org/10.3847/1538-3881/ad500a

M-dwarf stars provide us with an ideal opportunity to study nearby small planets. The HUnting for M Dwarf Rocky planets Using MAROON-X (HUMDRUM) survey uses the MAROON-X spectrograph, which is ideally suited to studying these stars, to measure precis... Read More about Early Results from the HUMDRUM Survey: A Small, Earth-mass Planet Orbits TOI-1450A.

NGTS-30b/TOI-4862b: An ~1 Gyr old 98-day transiting warm Jupiter (2024)
Journal Article
Battley, M. P., Collins, K. A., Ulmer-Moll, S., Quinn, S. N., Lendl, M., Gill, S., …Zhao, Y. (2024). NGTS-30b/TOI-4862b: An ~1 Gyr old 98-day transiting warm Jupiter. Astronomy & Astrophysics, 686, Article A230. https://doi.org/10.1051/0004-6361/202449307

Context. Long-period transiting exoplanets bridge the gap between the bulk of transit- and Doppler-based exoplanet discoveries, providing key insights into the formation and evolution of planetary systems. The wider separation between these planets a... Read More about NGTS-30b/TOI-4862b: An ~1 Gyr old 98-day transiting warm Jupiter.

BEBOP V. Homogeneous stellar analysis of potential circumbinary planet hosts (2024)
Journal Article
Freckelton, A. V., Sebastian, D., Mortier, A., Triaud, A. H. M. J., Maxted, P. F. L., Acuña, L., …Willett, E. (2024). BEBOP V. Homogeneous stellar analysis of potential circumbinary planet hosts. Monthly Notices of the Royal Astronomical Society, 531(4), 4085-4098. https://doi.org/10.1093/mnras/stae1405

Planets orbiting binary systems are relatively unexplored compared to those around single stars. Detections of circumbinary planets and planetary systems offer a first detailed view into our understanding of circumbinary planet formation and dynamica... Read More about BEBOP V. Homogeneous stellar analysis of potential circumbinary planet hosts.

GJ 238 b: A 0.57 Earth Radius Planet Orbiting an M2.5 Dwarf Star at 15.2 pc (2024)
Journal Article
Tey, E., Shporer, A., Lin, Z., Stassun, K. G., Lissauer, J. J., Hellier, C., …Jenkins, J. M. (2024). GJ 238 b: A 0.57 Earth Radius Planet Orbiting an M2.5 Dwarf Star at 15.2 pc. Astronomical Journal, 167(6), Article 283. https://doi.org/10.3847/1538-3881/ad3df1

We report the discovery of the transiting planet GJ 238 b, with a radius of 0.566 ± 0.014 R ⊕ (1.064 ± 0.026 times the radius of Mars) and an orbital period of 1.74 days. The transit signal was detected by the TESS mission and designated TOI-486.01.... Read More about GJ 238 b: A 0.57 Earth Radius Planet Orbiting an M2.5 Dwarf Star at 15.2 pc.

Gliese 12 b: A Temperate Earth-sized Planet at 12 pc Ideal for Atmospheric Transmission Spectroscopy (2024)
Journal Article
Kuzuhara, M., Fukui, A., Livingston, J. H., Caballero, J. A., de Leon, J. P., Hirano, T., …Zapatero Osorio, M. R. (2024). Gliese 12 b: A Temperate Earth-sized Planet at 12 pc Ideal for Atmospheric Transmission Spectroscopy. Astrophysical Journal Letters, 967(2), Article L21. https://doi.org/10.3847/2041-8213/ad3642

Recent discoveries of Earth-sized planets transiting nearby M dwarfs have made it possible to characterize the atmospheres of terrestrial planets via follow-up spectroscopic observations. However, the number of such planets receiving low insolation i... Read More about Gliese 12 b: A Temperate Earth-sized Planet at 12 pc Ideal for Atmospheric Transmission Spectroscopy.

TOI-4438 b: a transiting mini-Neptune amenable to atmospheric characterization (2024)
Journal Article
Goffo, E., Chaturvedi, P., Murgas, F., Morello, G., Orell-Miquel, J., Acuña, L., …Zechmeister, M. (2024). TOI-4438 b: a transiting mini-Neptune amenable to atmospheric characterization. Astronomy & Astrophysics, 685, Article A147. https://doi.org/10.1051/0004-6361/202349133

We report the confirmation and mass determination of a mini-Neptune transiting the M3.5 V star TOI-4438 (G 182-34) every 7.44 days. A transit signal was detected with NASA's TESS space mission in the sectors 40, 52, and 53. In order to validate the p... Read More about TOI-4438 b: a transiting mini-Neptune amenable to atmospheric characterization.

An extended low-density atmosphere around the Jupiter-sized planet WASP-193 b (2024)
Journal Article
Barkaoui, K., Pozuelos, F. J., Hellier, C., Smalley, B., Nielsen, L. D., Niraula, P., …West, R. G. (in press). An extended low-density atmosphere around the Jupiter-sized planet WASP-193 b. Nature Astronomy, https://doi.org/10.1038/s41550-024-02259-y

Gas giants transiting bright nearby stars provide crucial insights into planetary system formation and evolution mechanisms. Most of these planets show certain average characteristics, serving as benchmarks for our understanding of planetary systems.... Read More about An extended low-density atmosphere around the Jupiter-sized planet WASP-193 b.

Discovery of two warm mini-Neptunes with contrasting densities orbiting the young K3V star TOI-815 (2024)
Journal Article
Psaridi, A., Osborn, H., Bouchy, F., Lendl, M., Parc, L., Billot, N., …West, R. G. (2024). Discovery of two warm mini-Neptunes with contrasting densities orbiting the young K3V star TOI-815. Astronomy & Astrophysics, 685, Article A5. https://doi.org/10.1051/0004-6361/202348678

We present the discovery and characterization of two warm mini-Neptunes transiting the K-V star TOI-815 in a K-M binary system. Analysis of its spectra and rotation period reveal the star to be young, with an age of 200(-200)(+400) Myr. TOI-815b has... Read More about Discovery of two warm mini-Neptunes with contrasting densities orbiting the young K3V star TOI-815.

Identification of the Top TESS Objects of Interest for Atmospheric Characterization of Transiting Exoplanets with JWST (2024)
Journal Article
Hord, B. J., Kempton, E. M., M. Evans-Soma, T., Latham, D. W., Ciardi, D. R., Dragomir, D., …Zucker, S. (2024). Identification of the Top TESS Objects of Interest for Atmospheric Characterization of Transiting Exoplanets with JWST. Astronomical Journal, 167(5), Article 233. https://doi.org/10.3847/1538-3881/ad3068

JWST has ushered in an era of unprecedented ability to characterize exoplanetary atmospheres. While there are over 5000 confirmed planets, more than 4000 Transiting Exoplanet Survey Satellite (TESS) planet candidates are still unconfirmed and many of... Read More about Identification of the Top TESS Objects of Interest for Atmospheric Characterization of Transiting Exoplanets with JWST.

The EBLM Project– XI. Mass, radius, and effective temperature measurements for 23 M-dwarf companions to solar-type stars observed with CHEOPS (2024)
Journal Article
Swayne, M. I., Maxted, P. F. L., Triaud, A. H. M. J., Sousa, S. G., Deline, A., Ehrenreich, D., …Wilson, T. G. (2024). The EBLM Project– XI. Mass, radius, and effective temperature measurements for 23 M-dwarf companions to solar-type stars observed with CHEOPS. Monthly Notices of the Royal Astronomical Society, 528(4), 5703-5722. https://doi.org/10.1093/mnras/stad3866

Observations of low-mass stars have frequently shown a disagreement between observed stellar radii and radii predicted by theoretical stellar structure models. This ‘radius inflation’ problem could have an impact on both stellar and exoplanetary scie... Read More about The EBLM Project– XI. Mass, radius, and effective temperature measurements for 23 M-dwarf companions to solar-type stars observed with CHEOPS.

The GAPS programme at TNG: L. TOI-4515 b: An eccentric warm Jupiter orbiting a 1.2 Gyr-old G-star (2024)
Journal Article
Carleo, I., Malavolta, L., Desidera, S., Nardiello, D., Wang, S., Turrini, D., …Zingales, T. (2024). The GAPS programme at TNG: L. TOI-4515 b: An eccentric warm Jupiter orbiting a 1.2 Gyr-old G-star. Astronomy & Astrophysics, 682, Article A135. https://doi.org/10.1051/0004-6361/202348207

Context. Different theories have been developed to explain the origins and properties of close-in giant planets, but none of them alone can explain all of the properties of the warm Jupiters (WJs, Porb = 10–200 days). One of the most intriguing chara... Read More about The GAPS programme at TNG: L. TOI-4515 b: An eccentric warm Jupiter orbiting a 1.2 Gyr-old G-star.

TOI-544 b: a potential water-world inside the radius valley in a two-planet system (2023)
Journal Article
Osborne, H. L. M., Van Eylen, V., Goffo, E., Gandolfi, D., Nowak, G., Persson, C. M., …Lam, K. W. F. (in press). TOI-544 b: a potential water-world inside the radius valley in a two-planet system. Monthly Notices of the Royal Astronomical Society, 527(4), 11138-11157. https://doi.org/10.1093/mnras/stad3837

We report on the precise radial velocity follow-up of TOI-544 (HD 290498), a bright K star (V=10.8), which hosts a small transiting planet recently discovered by the Transiting Exoplanet Survey Satellite (TESS). We collected 122 high-resolution HARPS... Read More about TOI-544 b: a potential water-world inside the radius valley in a two-planet system.

Giant Outer Transiting Exoplanet Mass (GOT ’EM) Survey. III. Recovery and Confirmation of a Temperate, Mildly Eccentric, Single-transit Jupiter Orbiting TOI-2010 (2023)
Journal Article
Mann, C. R., Dalba, P. A., Lafrenière, D., Fulton, B. J., Hébrard, G., Boisse, I., …Ting, E. B. (2023). Giant Outer Transiting Exoplanet Mass (GOT ’EM) Survey. III. Recovery and Confirmation of a Temperate, Mildly Eccentric, Single-transit Jupiter Orbiting TOI-2010. Astronomical Journal, 166(6), Article 239. https://doi.org/10.3847/1538-3881/ad00bc

Large-scale exoplanet surveys like the Transiting Exoplanet Survey Satellite (TESS) mission are powerful tools for discovering large numbers of exoplanet candidates. Single-transit events are commonplace within the resulting candidate list due to the... Read More about Giant Outer Transiting Exoplanet Mass (GOT ’EM) Survey. III. Recovery and Confirmation of a Temperate, Mildly Eccentric, Single-transit Jupiter Orbiting TOI-2010.

TOI-858 B b: A hot Jupiter on a polar orbit in a loose binary (2023)
Journal Article
Hagelberg, J., Nielsen, L. D., Attia, O., Bourrier, V., Pearce, L., Venturini, J., …Ziegler, C. (2023). TOI-858 B b: A hot Jupiter on a polar orbit in a loose binary. Astronomy & Astrophysics, 679, Article A70. https://doi.org/10.1051/0004-6361/202244940

We report the discovery of a hot Jupiter on a 3.28-day orbit around a 1.08 M⊙ G0 star that is the secondary component in a loose binary system. Based on follow-up radial velocity observations of TOI-858 B with CORALIE on the Swiss 1.2 m telescope and... Read More about TOI-858 B b: A hot Jupiter on a polar orbit in a loose binary.

TESS giants transiting giants V - Two hot Jupiters orbiting red-giant hosts (2023)
Journal Article
Pereira, F., Grunblatt, S. K., Psaridi, A., Campante, T. L., Cunha, M. S., Santos, N. C., …Huber, D. (in press). TESS giants transiting giants V - Two hot Jupiters orbiting red-giant hosts. Monthly Notices of the Royal Astronomical Society, 527(3), 6332-6345. https://doi.org/10.1093/mnras/stad3449

In this work we present the discovery and confirmation of two hot Jupiters orbiting red-giant stars, TOI-4377 b and TOI-4551 b, observed by TESS in the southern ecliptic hemisphere and later followed-up with radial-velocity (RV) observations. For TOI... Read More about TESS giants transiting giants V - Two hot Jupiters orbiting red-giant hosts.

A hot mini-Neptune and a temperate, highly eccentric sub-Saturn around the bright K-dwarf TOI-2134 (2023)
Journal Article
Rescigno, F., Hébrard, G., Vanderburg, A., Mann, A. W., Mortier, A., Morrell, S., …Forés-Toribio, R. (in press). A hot mini-Neptune and a temperate, highly eccentric sub-Saturn around the bright K-dwarf TOI-2134. Monthly Notices of the Royal Astronomical Society, 527(3), 5385-5407. https://doi.org/10.1093/mnras/stad3255

We present the characterisation of an inner mini-Neptune in a 9.2292005±0.0000063 day orbit and an outer mono-transiting sub-Saturn planet in a 95.50$^{+0.36}_{-0.25}$ day orbit around the moderately active, bright (mv = 8.9 mag) K5V star TOI-2134. B... Read More about A hot mini-Neptune and a temperate, highly eccentric sub-Saturn around the bright K-dwarf TOI-2134.

Two mini-Neptunes transiting the adolescent K-star HIP 113103 confirmed with TESS and CHEOPS (2023)
Journal Article
Lowson, N., Zhou, G., Huang, C. X., Wright, D. J., Edwards, B., Nabbie, E., …Addison, B. C. (2024). Two mini-Neptunes transiting the adolescent K-star HIP 113103 confirmed with TESS and CHEOPS. Monthly Notices of the Royal Astronomical Society, 527(1), 1146-1162. https://doi.org/10.1093/mnras/stad2756

We report the discovery of two mini-Neptunes in near 2:1 resonance orbits (P = 7.610303 d for HIP 113103 b and P = 14.245651 d for HIP 113103 c ) around the adolescent K-star HIP 113103 (TIC 121490076 ). The planet system was first identified from th... Read More about Two mini-Neptunes transiting the adolescent K-star HIP 113103 confirmed with TESS and CHEOPS.

TOI-332 b: A super dense Neptune found deep within the Neptunian desert (2023)
Journal Article
Osborn, A., Armstrong, D. J., Fernández, J. F., Knierim, H., Adibekyan, V., Collins, K. A., …Wheatley, P. J. (in press). TOI-332 b: A super dense Neptune found deep within the Neptunian desert. Monthly Notices of the Royal Astronomical Society, 526(1), 548-566. https://doi.org/10.1093/mnras/stad2575

To date, thousands of planets have been discovered, but there are regions of the orbital parameter space that are still bare. An example is the short period and intermediate mass/radius space known as the ‘Neptunian desert’, where planets should be e... Read More about TOI-332 b: A super dense Neptune found deep within the Neptunian desert.