Search Publications
Slow Rotation for the Super-puff Planet Kepler-51d
Winn, Joshua N.; Lammers, Caleb
Super-puffs are low-density planets of unknown origin and composition. If they form by accreting nebular gas through a circumplanetary disk, one might expect super-puffs to be spinning quickly. Here, we derive upper limits on the rotational oblateness of the super-puff Kepler-51d, based on precise transit observations with the NIRSpec instrument o…
Radial Wave in the Galactic Disk: New Clues to Discriminate Different Perturbations
Antoja, Teresa; Schönrich, Ralph; Li, Zhao-Yu +1 more
Decoding the key dynamical processes that shape the Galactic disk structure is crucial for reconstructing the Milky Way's evolution history. The second Gaia data release unveils a novel wave pattern in the L Z ‑<V R > space, but its formation mechanism remains elusive due to the intricate nature of involved perturbati…
The Orbit and Companion of PSR J1622-0315: Variable Asymmetry and a Massive Neutron Star
Kennedy, Mark R.; Turchetta, Marco; Sen, Bidisha +6 more
The companion to PSR J1622-0315, one of the most compact known redback millisecond pulsars, shows extremely low irradiation despite its short orbital period. We model this system to determine the binary parameters, combining optical observations from the New Technology Telescope in 2017 and the Nordic Optical Telescope in 2022 with the binary mode…
Assessing the Performance of the ADAPT and AFT Flux Transport Models Using In Situ Measurements from Multiple Satellites
Warren, Harry P.; Linton, Mark G.; Ugarte-Urra, Ignacio +7 more
The launches of Parker Solar Probe (Parker) and Solar Orbiter (SolO) are enabling a new era of solar wind studies that track the solar wind from its origin at the photosphere, through the corona, to multiple vantage points in the inner heliosphere. A key ingredient for these models is the input photospheric magnetic field map that provides the bou…
VaDAR: Varstrometry for Dual AGN Using Radio Interferometry
Nyland, Kristina; Clarke, Tracy E.; Satyapal, Shobita +5 more
Binary and dual active galactic nuclei (AGNs) are an important observational tool for studying the formation and dynamical evolution of galaxies and supermassive black holes. An entirely new method for identifying possible AGN pairs makes use of the exquisite positional accuracy of Gaia to detect astrometrically variable quasars, in tandem with th…
Star Formation in the H II Region Sh2-87: Evidence of Global Hierarchical Collapse
Baug, Tapas; Biswas, Siddhartha; Mondal, Soumen +3 more
We present a detailed study of the Sh2-87 H II region using a multiwavelength data set in optical to radio bands. A Herschel column density map revealed that the host cloud is filamentary in nature, and together they formed a central dense hub. The extinction map generated using near-infrared photometric data also signifies the nonuniform distribu…
Evidence for Abiotic Dimethyl Sulfide in Cometary Matter
De Keyser, Johan; Altwegg, Kathrin; Hänni, Nora +5 more
Technological progress related to astronomical observatories such as the recently launched James Webb Space Telescope (JWST) allows searching for signs of life beyond our solar system, namely, in the form of unambiguous biosignature gases in exoplanetary atmospheres. The tentative assignment of a 1σ–2.4σ spectral feature observed with JWST in the …
A Self-consistent Model of Shock-heated Plasma in Nonequilibrium States for Direct Parameter Constraints from X-Ray Observations
Yamaguchi, Hiroya; Ohshiro, Yuken; Suzuki, Shunsuke +2 more
X-ray observations of shock-heated plasmas, such as those found in supernova remnants (SNRs), often exhibit features of temperature and ionization nonequilibrium. For accurate interpretation of these observations, proper calculations of the equilibration processes are essential. Here, we present a self-consistent model of thermal X-ray emission fr…
Magnetic Fields of the Starless Core L 1512
Pattle, Kate; Ward-Thompson, Derek; Berry, David +6 more
We present JCMT POL-2 850 µm dust polarization observations and Mimir H-band stellar polarization observations toward the starless core L 1512. We detect the highly ordered core-scale magnetic field traced by the POL-2 data, of which the field orientation is consistent with the parsec-scale magnetic fields traced by Planck data, suggesting t…
The MIRI Exoplanets Orbiting White dwarfs (MEOW) Survey: Mid-infrared Excess Reveals a Giant Planet Candidate around a Nearby White Dwarf
Vanderburg, Andrew; Stevenson, Kevin B.; MacDonald, Ryan J. +17 more
The MIRI Exoplanets Orbiting White dwarfs survey is a cycle 2 JWST program to search for exoplanets around dozens of nearby white dwarfs via infrared excess and direct imaging. In this Letter, we present the detection of mid-infrared excess at 18 and 21 µm toward the bright (V = 11.4) metal-polluted white dwarf WD 0310–688. The source of the…