Search Publications
STRIDES: automated uniform models for 30 quadruply imaged quasars
Bacon, D.; Smith, M.; Annis, J. +69 more
Gravitational time delays provide a powerful one-step measurement of H0, independent of all other probes. One key ingredient in time-delay cosmography are high-accuracy lens models. Those are currently expensive to obtain, both, in terms of computing and investigator time (105-106 CPU hours and ~0.5-1 yr, respectiv…
Detection of Atmospheric Escape from Four Young Mini-Neptunes
Knutson, Heather A.; Ricker, George R.; Dai, Fei +5 more
We use Keck/NIRSPEC to survey a sample of of young (<1 Gyr), short-period mini-Neptunes orbiting nearby K dwarfs to measure their mass loss via the metastable helium line. We detect helium absorption from all four of the targets in our initial sample. The first detection, around TOI 560b, was announced in a previous paper. We now announce three…
Methane throughout the atmosphere of the warm exoplanet WASP-80b
Fortney, Jonathan J.; Boyer, Martha L.; Bell, Taylor J. +12 more
The abundances of main carbon- and oxygen-bearing gases in the atmospheres of giant exoplanets provide insights into atmospheric chemistry and planet formation processes1,2. Thermochemistry suggests that methane (CH4) should be the dominant carbon-bearing species below about 1,000 K over a range of plausible atmospheric compo…
Gaia Data Release 3. The second Gaia catalogue of long-period variable candidates
Audard, M.; Rimoldini, L.; Holl, B. +9 more
Context. The third Gaia Data Release covers 34 months of data and includes the second Gaia catalogue of long-period variables (LPVs), with G variability amplitudes larger than 0.1 mag (5-95% quantile range).
Aims: The paper describes the production and content of the second Gaia catalogue of LPVs and the methods we used to compute the publish…
JWST/NIRCam observations of stars and H II regions in z ≃ 6-8 galaxies: properties of star-forming complexes on 150 pc scales
Charlot, Stéphane; Chen, Zuyi; Stark, Daniel P. +3 more
The onset of the JWST-era provides a much-improved opportunity to characterize the resolved structure of early star-forming systems. Previous Spitzer observations of z ≳ 6 galaxies revealed the presence of old stars and luminous H II regions (via [O III]+H β emission), but the poor resolution stunted our ability to map their locations with respect…
Uncovering a population of gravitational lens galaxies with magnified standard candle SN Zwicky
Richard, Johan; Riddle, Reed; Wheeler, J. Craig +35 more
Detecting gravitationally lensed supernovae is among the biggest challenges in astronomy. It involves a combination of two very rare phenomena: catching the transient signal of a stellar explosion in a distant galaxy and observing it through a nearly perfectly aligned foreground galaxy that deflects light towards the observer. Here we describe how…
GOALS-JWST: Mid-infrared Spectroscopy of the Nucleus of NGC 7469
Malkan, M. A.; Inami, H.; Murphy, E. J. +32 more
We present mid-infrared spectroscopic observations of the nucleus of the nearby Seyfert galaxy NGC 7469 taken with the MIRI instrument on the James Webb Space Telescope (JWST) as part of Directors Discretionary Time Early Release Science program 1328. The high-resolution nuclear spectrum contains 19 emission lines covering a wide range of ionizati…
Possible Detection of the Progenitor of the Type II Supernova SN 2023ixf
Shara, Michael M.; Pledger, Joanne L.
Stellar evolution theory predicts multiple pathways to the explosive deaths of stars as supernovae. Locating and characterizing the progenitors of well-studied supernovae is important to constrain the theory and to justify and design future surveys to improve on progenitor detections. Here we report the serendipitous preexplosion imaging, by the H…
Exploring the Ability of Hubble Space Telescope WFC3 G141 to Uncover Trends in Populations of Exoplanet Atmospheres through a Homogeneous Transmission Survey of 70 Gaseous Planets
Bouwman, Jeroen; Lagage, Pierre-Olivier; Changeat, Quentin +14 more
We present analysis of the atmospheres of 70 gaseous extrasolar planets via transit spectroscopy with Hubble's Wide Field Camera 3 (WFC3). For over half of these, we statistically detect spectral modulation that our retrievals attribute to molecular species. Among these, we use Bayesian hierarchical modeling to search for chemical trends with bulk…
The Million Quasars (Milliquas) Catalogue, v8
Flesch, Eric Wim
Announcing the final release, v8, of the Milliquas (Million Quasars) quasar catalogue which presents all published quasars to 30 June 2023, including quasars from the first releases of the Dark Energy Spectroscopic Instrument (DESI) and the SDSS-DR18 Black Hole Mapper. Its totals are 907,144 type-I QSOs/AGN and 66,026 high-confidence (~99% likelih…