4 research outputs found
TOI-2015b: A Warm Neptune with Transit Timing Variations Orbiting an Active mid M Dwarf
We report the discovery of a close-in () warm Neptune with clear transit timing variations (TTVs)
orbiting the nearby () active M4 star, TOI-2015. We
characterize the planet's properties using TESS photometry, precise
near-infrared radial velocities (RV) with the Habitable-zone Planet Finder (HP)
Spectrograph, ground-based photometry, and high-contrast imaging. A joint
photometry and RV fit yields a radius , mass , and
density for TOI-2015b,
suggesting a likely volatile-rich planet. The young, active host star has a
rotation period of and
associated rotation-based age estimate of . Though
no other transiting planets are seen in the TESS data, the system shows clear
TTVs of super period and
amplitude . After considering multiple likely
period ratio models, we show an outer planet candidate near a 2:1 resonance can
explain the observed TTVs while offering a dynamically stable solution.
However, other possible two-planet solutions -- including 3:2 and 4:3 resonance
-- cannot be conclusively excluded without further observations. Assuming a 2:1
resonance in the joint TTV-RV modeling suggests a mass of
for TOI-2015b and
for the outer candidate.
Additional transit and RV observations will be beneficial to explicitly
identify the resonance and further characterize the properties of the system.Comment: 28 pages, 15 figures, 6 tables. As submitted to AAS Journal
TOI-3984 A b and TOI-5293 A b: two temperate gas giants transiting mid-M dwarfs in wide binary systems
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
() is an M4 dwarf hosting a short-period (
days) gas giant ( and
) with a wide separation white dwarf companion.
TOI-5293 A () is an M3 dwarf hosting a short-period ( days) gas giant ( and
) with a wide separation M dwarf companion. We
characterize both systems using a combination of ground-based and space-based
photometry, speckle imaging, and high-precision radial velocities from the
Habitable-zone Planet Finder and NEID spectrographs. TOI-3984 A b
( K and ) and TOI-5293 A b
( K and ) 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 characterization of temperate
gas giants and three-dimensional obliquity measurements to probe system
architecture and migration scenarios.Comment: Submitted to AJ, 42 pages, 14 figures. arXiv admin note: substantial
text overlap with arXiv:2201.0996