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Deep Orbital Search for Additional Planets in the HR 8799 System
Do Ó, Clarissa R.; De Rosa, Robert J.; Macintosh, Bruce +6 more
The HR 8799 system hosts four massive planets orbiting 15 and 80 au. Studies of the system's orbital stability and its outer debris disk open the possibility of additional planets, both interior to and exterior to the known system. Reaching a sufficient sensitivity to search for interior planets is very challenging due to the combination of bright…
The TESS-Keck Survey. XVI. Mass Measurements for 12 Planets in Eight Systems
Anderson, Jay; Dattilo, Anne; Batalha, Natalie M. +45 more
With JWST's successful deployment and unexpectedly high fuel reserves, measuring the masses of sub-Neptunes transiting bright, nearby stars will soon become the bottleneck for characterizing the atmospheres of small exoplanets via transmission spectroscopy. Using a carefully curated target list and observations from more than 2 yr of APF-Levy and …
Using Photometrically Derived Properties of Young Stars to Refine TESS's Transiting Young Planet Survey Completeness
Pascucci, Ilaria; Cunha, Katia; Mamajek, Eric E. +7 more
The demographics of young exoplanets can shed light on their formation and evolution processes. Exoplanet properties are derived from the properties of their host stars. As such, it is important to accurately characterize the host stars since any systematic biases in their derivation can negatively impact the derivation of planetary properties. He…
Binary Star Evolution in Different Environments: Filamentary, Fractal, Halo, and Tidal Tail Clusters
Tang, Shih-Yun; Pang, Xiaoying; Li, Chengyuan +7 more
Using membership of 85 open clusters from previous studies based on Gaia Data Release 3 data, we identify binary candidates in the color-magnitude diagram for systems with mass ratio q > 0.4. The binary fraction is corrected for incompleteness at different distances due to the Gaia angular resolution limit. We find a decreasing binary fraction …
TOI-199 b: A Well-characterized 100 day Transiting Warm Giant Planet with TTVs Seen from Antarctica
Trifonov, Trifon; Henning, Thomas; Latham, David W. +49 more
We present the spectroscopic confirmation and precise mass measurement of the warm giant planet TOI-199 b. This planet was first identified in TESS photometry and confirmed using ground-based photometry from ASTEP in Antarctica including a full 6.5 hr long transit, PEST, Hazelwood, and LCO; space photometry from NEOSSat; and radial velocities (RVs…
JWST/NIRCam Coronagraphy of the Young Planet-hosting Debris Disk AU Microscopii
Barclay, Thomas; Young, Erick T.; Boccaletti, Anthony +20 more
High-contrast imaging of debris disk systems permits us to assess the composition and size distribution of circumstellar dust, to probe recent dynamical histories, and to directly detect and characterize embedded exoplanets. Observations of these systems in the infrared beyond 2-3 µm promise access to both extremely favorable planet contrast…
A Mini-Neptune Orbiting the Metal-poor K Dwarf BD+29 2654
Hellier, Coel; Batalha, Natalie M.; Kane, Stephen R. +48 more
We report the discovery and Doppler mass measurement of a 7.4 days 2.3 R ⊕ mini-Neptune around a metal-poor K dwarf BD+29 2654 (TOI-2018). Based on a high-resolution Keck/HIRES spectrum, the Gaia parallax, and multiwavelength photometry from the UV to the mid-infrared, we found that the host star has ${T}_{\mathrm{eff}}={4174}_{-42}^{+3…
A Massive Hot Jupiter Orbiting a Metal-rich Early M Star Discovered in the TESS Full-frame Images
Latham, David W.; Quinn, Samuel N.; Littlefield, Colin +41 more
Observations and statistical studies have shown that giant planets are rare around M dwarfs compared with Sun-like stars. The formation mechanism of these extreme systems has remained under debate for decades. With the help of the TESS mission and ground-based follow-up observations, we report the discovery of TOI-4201b, the most massive and dense…
TOI-4562b: A Highly Eccentric Temperate Jupiter Analog Orbiting a Young Field Star
Hellier, Coel; Rampalli, Rayna; Latham, David W. +47 more
We report the discovery of TOI-4562b (TIC-349576261), a Jovian planet orbiting a young F7V-type star, younger than the Praesepe/Hyades clusters (<700 Myr). This planet stands out because of its unusually long orbital period for transiting planets with known masses (P orb = 225.11781 ${}_{-0.00022}^{+0.00025}$ days) and because it has…
Mass Accretion, Spectral, and Photometric Properties of T Tauri Stars in Taurus Based on TESS and LAMOST
Lin, Chia-Lung; Ip, Wing-Huen; Luo, A. -Li +3 more
We present the analysis of 16 classical T Tauri stars (CTTSs) using LAMOST and TESS data, investigating spectral properties, photometric variations, and mass accretion rates. All 16 stars exhibit emissions in Hα lines, from which the average mass accretion rate of 1.76 × 10‑9 M ⊙ yr‑1 is derived. Two of the stars, …