Search Publications
Spatially resolved imaging of the inner Fomalhaut disk using JWST/MIRI
Rieke, George H.; Gáspár, András; Beichman, Charles +9 more
Planetary debris disks around other stars are analogous to the asteroid and Kuiper belts in the Solar System. Their structure reveals the configuration of small bodies and provides hints for the presence of planets. The nearby star Fomalhaut hosts one of the most prominent debris disks, resolved by the Hubble Space Telescope, Spitzer, Herschel and…
X-Ray Polarization of BL Lacertae in Outburst
Kaaret, Philip; Wu, Kinwah; Enoto, Teruaki +128 more
We report the first >99% confidence detection of X-ray polarization in BL Lacertae. During a recent X-ray/γ-ray outburst, a 287 ks observation (2022 November 27-30) was taken using the Imaging X-ray Polarimetry Explorer (IXPE), together with contemporaneous multiwavelength observations from the Neil Gehrels Swift observatory and XMM-Newton in s…
The Gaia-ESO Survey: Homogenisation of stellar parameters and elemental abundances
Prusti, T.; Gilmore, G.; Montes, D. +59 more
The Gaia-ESO Survey is a public spectroscopic survey that targeted ≳105 stars covering all major components of the Milky Way from the end of 2011 to 2018, delivering its final public release in May 2022. Unlike other spectroscopic surveys, Gaia-ESO is the only survey that observed stars across all spectral types with dedicated, speciali…
The Large Array Survey Telescope-System Overview and Performances
Gal-Yam, A.; Kowalski, M.; Sadeh, I. +38 more
The Large Array Survey Telescope (LAST) is a wide-field visible-light telescope array designed to explore the variable and transient sky with a high cadence. LAST will be composed of 48, 28 cm f/2.2 telescopes (32 already installed) equipped with full-frame backside-illuminated cooled CMOS detectors. Each telescope provides a field of view (FoV) o…
Direct images and spectroscopy of a giant protoplanet driving spiral arms in MWC 758.
Dong, Ruobing; Wagner, Kevin; Stone, Jordan +23 more
Understanding the driving forces behind spiral arms in protoplanetary disks remains a challenge due to the faintness of young giant planets. MWC 758 hosts such a protoplanetary disk with a two-armed spiral pattern that is suggested to be driven by an external giant planet. We present observations in the thermal infrared that are uniquely sensitive…
Machine learning in solar physics
Cheung, Mark C. M.; Asensio Ramos, Andrés; Chifu, Iulia +1 more
The application of machine learning in solar physics has the potential to greatly enhance our understanding of the complex processes that take place in the atmosphere of the Sun. By using techniques such as deep learning, we are now in the position to analyze large amounts of data from solar observations and identify patterns and trends that may n…
X-Ray Polarization Observations of BL Lacertae
Wu, Kinwah; Masiero, Joseph R.; Tinyanont, Samaporn +144 more
Blazars are a class of jet-dominated active galactic nuclei with a typical double-humped spectral energy distribution. It is of common consensus that the synchrotron emission is responsible for the low frequency peak, while the origin of the high frequency hump is still debated. The analysis of X-rays and their polarization can provide a valuable …
Mass Models of the Milky Way and Estimation of Its Mass from the Gaia DR3 Data Set
Capuzzo-Dolcetta, Roberto; Sylos Labini, Francesco; Chrobáková, Žofia +1 more
We use data from the Gaia DR3 data set to estimate the mass of the Milky Way (MW) by analyzing the rotation curve in the range of distances 5 to 28 kpc. We consider three mass models: The first model adds a spherical dark matter (DM) halo, following the Navarro-Frenk-White (NFW) profile, to the known stellar components. The second model assumes th…
Early Insights for Atmospheric Retrievals of Exoplanets Using JWST Transit Spectroscopy
Madhusudhan, Nikku; Constantinou, Savvas; Gandhi, Siddharth
We have entered the era of the James Webb Space Telescope (JWST). We use the first JWST transmission spectrum of the hot Saturn-mass exoplanet, WASP-39 b, obtained with the NIRSpec instrument in the 3-5 µm range to investigate (a) what atmospheric constraints are possible with JWST-quality data in this spectral range, (b) requirements for at…
The connection between the escape of ionizing radiation and galaxy properties at z ∼ 3 in the Keck Lyman continuum spectroscopic survey
Steidel, Charles C.; Reddy, Naveen A.; Shapley, Alice +4 more
The connection between the escape fraction of ionizing radiation (fesc) and the properties of galaxies, such as stellar mass ($\rm M_{\rm *}$), age, star-formation rate (SFR), and dust content, are key inputs for reionization models, but many of these relationships remain untested at high redshift. We present an analysis of a sample of …