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1. TOI-3714 b and TOI-3629 b: Two Gas Giants Transiting M Dwarfs Confirmed with the Habitable-zone Planet Finder and NEID

   https://doi.org/10.3847/1538-3881/ac7804  

   Cañas, Caleb I. ; Kanodia, Shubham ; Bender, Chad F. ; Mahadevan, Suvrath ; Stefánsson, Guđhmundur ; Cochran, William D. ; Lin, Andrea S. ; Hwang, Hsiang-Chih ; Powers, Luke ; Monson, Andrew ; et al ( July 2022 , The Astronomical Journal)

   Abstract We confirm the planetary nature of two gas giants discovered by the Transiting Exoplanet Survey Satellite to transit M dwarfs. TOI-3714 ( V = 15.24, J = 11.74) is an M2 dwarf hosting a hot Jupiter ( M p = 0.70 ± 0.03 M J and R p = 1.01 ± 0.03 R J ) on an orbital period of 2.154849 ± 0.000001 days with a resolved white dwarf companion. TOI-3629 ( V = 14.63, J = 11.42) is an M1 dwarf hosting a hot Jupiter ( M p = 0.26 ± 0.02 M J and R p =0.74 ± 0.02 R J ) on an orbital period of 3.936551 − 0.000006 + 0.000005 days. We characterize each transiting companion using a combination of ground-based and space-based photometry, speckle imaging, and high-precision velocimetry from the Habitable-zone Planet Finder and the NEID spectrographs. With the discovery of these two systems, there are now nine M dwarfs known to host transiting hot Jupiters. Among this population, TOI-3714 b ( T eq = 750 ± 20 K and TSM = 98 ± 7) and TOI-3629 b ( T eq = 690 ± 20 K and TSM = 80 ± 9) are warmmore »gas giants amenable to additional characterization with transmission spectroscopy to probe atmospheric chemistry and, for TOI-3714, obliquity measurements to probe formation scenarios.« less
2. TOI-3984 A b and TOI-5293 A b: Two Temperate Gas Giants Transiting Mid-M Dwarfs in Wide Binary Systems

   https://doi.org/10.3847/1538-3881/acdac7  

   Cañas, Caleb I. ; Kanodia, Shubham ; Libby-Roberts, Jessica ; Lin, Andrea S. ; Schutte, Maria ; Powers, Luke ; Jones, Sinclaire ; Monson, Andrew ; Wang, Songhu ; Stefánsson, Guđmundur ; et al ( June 2023 , The Astronomical Journal)

   Abstract We confirm the planetary nature of two gas giants discovered by TESS to transit M dwarfs with stellar companions at wide separations. TOI-3984 A ( J = 11.93) is an M4 dwarf hosting a short-period (4.353326 ± 0.000005 days) gas giant ( M p = 0.14 ± 0.03 M J and R p = 0.71 ± 0.02 R J ) with a wide-separation white dwarf companion. TOI-5293 A ( J = 12.47) is an M3 dwarf hosting a short-period (2.930289 ± 0.000004 days) gas giant ( M p = 0.54 ± 0.07 M J and R p = 1.06 ± 0.04 R J ) with a wide-separation M dwarf companion. We characterize both systems using a combination of ground- and space-based photometry, speckle imaging, and high-precision radial velocities from the Habitable-zone Planet Finder and NEID spectrographs. TOI-3984 A b ( T eq = 563 ± 15 K and TSM = 138 − 27 + 29 ) and TOI-5293 A b ( T eq = 675 − 30 + 42 K and TSM = 92 ± 14) are two of the coolest gas giants among the population of hot Jupiter–sized gas planets orbiting M dwarfs and are favorable targets for atmospheric characterizationmore »of temperate gas giants and 3D obliquity measurements to probe system architecture and migration scenarios.« less
3. TOI-824 b: A New Planet on the Lower Edge of the Hot Neptune Desert

   https://doi.org/10.3847/1538-3881/abac0c  

   Burt, Jennifer A. ; Nielsen, Louise D. ; Quinn, Samuel N. ; Mamajek, Eric E. ; Matthews, Elisabeth C. ; Zhou, George ; Seidel, Julia V. ; Huang, Chelsea X. ; Lopez, Eric ; Soto, Maritza ; et al ( October 2020 , The Astronomical Journal)
4. TOI-1235 b: A Keystone Super-Earth for Testing Radius Valley Emergence Models around Early M Dwarfs

   https://doi.org/10.3847/1538-3881/ab9534  

   Cloutier, Ryan ; Rodriguez, Joseph E. ; Irwin, Jonathan ; Charbonneau, David ; Stassun, Keivan G. ; Mortier, Annelies ; Latham, David W. ; Isaacson, Howard ; Howard, Andrew W. ; Udry, Stéphane ; et al ( July 2020 , The Astronomical Journal)
5. TOI-1075 b: A Dense, Massive, Ultra-short-period Hot Super-Earth Straddling the Radius Gap

   https://doi.org/10.3847/1538-3881/ac9c5b  

   Essack, Zahra ; Shporer, Avi ; Burt, Jennifer A. ; Seager, Sara ; Cambioni, Saverio ; Lin, Zifan ; Collins, Karen A. ; Mamajek, Eric E. ; Stassun, Keivan G. ; Ricker, George R. ; et al ( January 2023 , The Astronomical Journal)

   Populating the exoplanet mass–radius diagram in order to identify the underlying relationship that governs planet composition is driving an interdisciplinary effort within the exoplanet community. The discovery of hot super-Earths—a high-temperature, short-period subset of the super-Earth planet population—has presented many unresolved questions concerning the formation, evolution, and composition of rocky planets. We report the discovery of a transiting, ultra-short-period hot super-Earth orbitingTOI-1075(TIC351601843), a nearby (d= 61.4 pc) late-K/early-M-dwarf star, using data from the Transiting Exoplanet Survey Satellite. The newly discovered planet has a radius of 1.791${}_{-0.081}^{+0.116}$R_⊕and an orbital period of 0.605 day (14.5 hr). We precisely measure the planet mass to be 9.95${}_{-1.30}^{+1.36}$M_⊕using radial velocity measurements obtained with the Planet Finder Spectrograph mounted on the Magellan II telescope. Our radial velocity data also show a long-term trend, suggesting an additional planet in the system. While TOI-1075 b is expected to have a substantial H/He atmosphere given its size relative to the radius gap, its high density (${9.32}_{-1.85}^{+2.05}$g cm⁻³) is likely inconsistent with this possibility. We explore TOI-1075 b’s location relative to the M-dwarf radius valley, evaluate the planet’s prospects for atmospheric characterization, andmore »discuss potential planet formation mechanisms. Studying the TOI-1075 system in the broader context of ultra-short-period planetary systems is necessary for testing planet formation and evolution theories and density-enhancing mechanisms and for future atmospheric and surface characterization studies via emission spectroscopy with the JWST.

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