TOI-836: A super-Earth and mini-Neptune transiting a nearby K-dwarf

Monthly Notices of the Royal Astronomical Society · 2023 · 27 citations

• Physics
• Astronomy
• Astrobiology

ABSTRACT We present the discovery of two exoplanets transiting TOI-836 (TIC 440887364) using data from TESS Sector 11 and Sector 38. TOI-836 is a bright (T = 8.5 mag), high proper motion (∼200 mas yr−1), low metallicity ([Fe/H]≈−0.28) K-dwarf with a mass of 0.68 ± 0.05 M⊙ and a radius of 0.67 ± 0.01 R⊙. We obtain photometric follow-up observations with a variety of facilities, and we use these data sets to determine that the inner planet, TOI-836 b, is a 1.70 ± 0.07 R⊕ super-Earth in a 3.82-d orbit, placing it directly within the so-called ‘radius valley’. The outer planet, TOI-836 c, is a 2.59 ± 0.09 R⊕ mini-Neptune in an 8.60-d orbit. Radial velocity measurements reveal that TOI-836 b has a mass of 4.5 ± 0.9 M⊕, while TOI-836 c has a mass of 9.6 ± 2.6 M⊕. Photometric observations show Transit Timing Variations (TTVs) on the order of 20 min for TOI-836 c, although there are no detectable TTVs for TOI-836 b. The TTVs of planet TOI-836 c may be caused by an undetected exterior planet.

HAT-P-58b–HAT-P-64b: Seven Planets Transiting Bright Stars*

The Astronomical Journal · 2021 · 11 citations

• Physics
• Astrophysics

Abstract We report the discovery and characterization of seven transiting exoplanets from the HATNet survey. The planets, which are hot Jupiters and Saturns transiting bright Sun-like stars, include: HAT-P-58b (with mass M p = 0.37 M J , radius R p = 1.33 R J , and orbital period P = 4.0138 days), HAT-P-59b ( M p = 1.54 M J , R p = 1.12 R J , P = 4.1420 days), HAT-P-60b ( M p = 0.57 M J , R p = 1.63 R J , P = 4.7948 days), HAT-P-61b ( M p = 1.06 M J , R p = 0.90 R J , P = 1.9023 days), HAT-P-62b ( M p = 0.76 M J , R p = 1.07 R J , P = 2.6453 days), HAT-P-63b ( M p = 0.61 M J , R p = 1.12 R J , P = 3.3777 days), and HAT-P-64b ( M p = 0.58 M J , R p = 1.70 R J , P = 4.0072 days). The typical errors on these quantities are 0.06 M J , 0.03 R J , and 0.2 s, respectively. We also provide accurate stellar parameters for each of the host stars. With V = 9.710 ± 0.050 mag, HAT-P-60 is an especially bright transiting planet host, and an excellent target for additional follow-up observations. With R p = 1.703 ± 0.070 R J , HAT-P-64b is a highly inflated hot Jupiter around a star nearing the end of its main-sequence lifetime, and is among the largest known planets. Five of the seven systems have long-cadence observations by TESS which are included in the analysis. Of particular note is HAT-P-59 (TOI-1826.01) which is within the northern continuous viewing zone of the TESS mission, and HAT-P-60, which is the TESS candidate TOI-1580.01.

The TESS Objects of Interest Catalog from the TESS Prime Mission

The Astrophysical Journal Supplement Series · 2021 · 300 citations

• Computer Science
• Physics
• Astronomy

We present 2241 exoplanet candidates identified with data from the Transiting Exoplanet Survey Satellite (TESS) during its 2 yr Prime Mission. We list these candidates in the TESS Objects of Interest (TOI) Catalog, which includes both new planet candidates found by TESS and previously known planets recovered by TESS observations. We describe the process used to identify TOIs, investigate the characteristics of the new planet candidates, and discuss some notable TESS planet discoveries. The TOI catalog includes an unprecedented number of small planet candidates around nearby bright stars, which are well suited for detailed follow-up observations. The TESS data products for the Prime Mission (sectors 1-26), including the TOI catalog, light curves, full-frame images, and target pixel files, are publicly available at the Mikulski Archive for Space Telescopes.

ARCES Observations of the TESS Circumbinary Planet TIC 172900988b

The Astronomical Journal · 2021 · 55 citations

• Physics
• Astrophysics
• Astronomy

Abstract: Kostov et al. (2021) report the discovery of the first transiting circumbinary planet, detected from a single sector of TESS data. ARCES observations played a role in helping to establish the parameters of the system. We briefly present an overview of this interesting planetary system and then discuss the challenges encountered in analyzing ARCES data to derive accurate radial velocities for this project.

LightSound: A Sonification Tool for Observing Solar Eclipses

American Astronomical Society Meeting Abstracts #235 · 2020 · 1 citations

• Computer Science
• Computer Science
• Remote sensing