Search Publications
JWST-TST High Contrast: JWST/NIRCam Observations of the Young Giant Planet β Pic b
Stark, Christopher C.; Valenti, Jeff A.; van der Marel, Roeland P. +14 more
We present the first JWST/NIRCam observations of the directly imaged gas giant exoplanet β Pic b. Observations in six filters using NIRCam's round coronagraphic masks provide a high-signal-to-noise-ratio detection of β Pic b and the archetypal debris disk around β Pic over a wavelength range of ∼1.7–5 µm. This paper focuses on the detection …
The JWST/NIRISS Deep Spectroscopic Survey for Young Brown Dwarfs and Free-floating Planets
Johnstone, Doug; Albert, Loïc; Doyon, René +9 more
The discovery and characterization of free-floating planetary-mass objects (FFPMOs) is fundamental to our understanding of star and planet formation. Here we report results from an extremely deep spectroscopic survey of the young star cluster NGC1333 using Near-InfraRed Imager and Slitless Spectrograph (NIRISS) wide field slitless spectroscopy on …
Biases in Exoplanet Transmission Spectra Introduced by Limb-darkening Parametrization
Coulombe, Louis-Philippe; Benneke, Björn; Roy, Pierre-Alexis
One of the main endeavors of the field of exoplanetary sciences is the characterization of exoplanet atmospheres on a population level. The current method of choice to accomplish this task is transmission spectroscopy, where the apparent radius of a transiting exoplanet is measured at multiple wavelengths in search of atomic and molecular absorpti…
The ESO SupJup Survey. III. Confirmation of 13CO in YSES 1 b and Atmospheric Detection of YSES 1 c with CRIRES+
Kesseli, Aurora Y.; Zhang, Yapeng; Gandhi, Siddharth +14 more
High-resolution spectroscopic characterization of young super-Jovian planets enables precise constraints on elemental and isotopic abundances of their atmospheres. As part of the ESO SupJup Survey, we present high-resolution spectral observations of two wide-orbit super-Jupiters in YSES 1 (or TYC 8998-760-1) using the upgraded VLT/CRIRES+
Transient Corotating Clumps around Adolescent Low-mass Stars from Four Years of TESS
Jayaraman, Rahul; Winn, Joshua N.; Bakos, Gáspár Á. +5 more
Complex periodic variables (CPVs) are stars that exhibit highly structured and periodic optical light curves. Previous studies have indicated that these stars are typically disk-free pre-main-sequence M dwarfs with rotation periods ranging from 0.2 to 2 days. To advance our understanding of these enigmatic objects, we conducted a blind search usin…
TESS Giants Transiting Giants. VI. Newly Discovered Hot Jupiters Provide Evidence for Efficient Obliquity Damping after the Main Sequence
Vanderburg, Andrew; Rice, Malena; Tan, Thiam-Guan +53 more
The degree of alignment between a star's spin axis and the orbital plane of its planets (the stellar obliquity) is related to interesting and poorly understood processes that occur during planet formation and evolution. Hot Jupiters orbiting hot stars (≳6250 K) display a wide range of obliquities, while similar planets orbiting cool stars are pref…
PHANGS Hubble Space Telescope Treasury Survey: Globular Cluster Systems in 17 Nearby Spiral Galaxies
Leroy, Adam K.; Rosolowsky, Erik; Klessen, Ralf S. +18 more
We present new catalogs of likely globular clusters (GCs) in 17 nearby spiral galaxies studied as part of the PHANGS Hubble Space Telescope (HST) Treasury Survey. The galaxies were imaged in five broadband filters from the near-ultraviolet through the I band. PHANGS-HST has produced catalogs of stellar clusters of all ages by selecting extended so…
A MIRI Search for Planets and Dust around WD 2149+021
Barclay, Thomas; Hermes, J. J.; Reach, William T. +9 more
The launch of JWST has ushered in a new era of high-precision infrared astronomy, allowing us to probe nearby white dwarfs for cold dust, exoplanets, and tidally heated exomoons. While previous searches for these exoplanets have successfully ruled out companions as small as 7–10 Jupiter masses (M Jup), no instrument prior to JWST has be…
Accurate and Model-independent Radius Determination of Single FGK and M Dwarfs Using Gaia DR3 Data
Kiman, Rocio; Faherty, Jacqueline K.; Brandt, Timothy D. +1 more
Measuring fundamental stellar parameters is key to fully comprehending the evolution of stars. However, current theoretical models overpredict effective temperatures, and underpredict radii, compared to observations of K and M dwarfs (radius inflation problem). In this work, we have developed a model-independent method to infer precise radii of si…
KMT-2023-BLG-2669: Ninth Free-floating Planet Candidate with θ E Measurements
Han, Cheongho; Lee, Chung-Uk; Zang, Weicheng +17 more
We report a free-floating planet (FFP) candidate identified from the analysis of the microlensing event KMT-2023-BLG-2669. The lensing light curve is characterized by a short duration (≲3 days) and a small amplitude (≲0.7 mag). From the analysis, we find an Einstein timescale of t E ⋍ 0.33 days and an Einstein radius of θ E ⋍…