Search Publications
HelioSwarm: A Multipoint, Multiscale Mission to Characterize Turbulence
Verscharen, Daniel; Retinò, Alessandro; Alexandrova, Olga +47 more
HelioSwarm (HS) is a NASA Medium-Class Explorer mission of the Heliophysics Division designed to explore the dynamic three-dimensional mechanisms controlling the physics of plasma turbulence, a ubiquitous process occurring in the heliosphere and in plasmas throughout the universe. This will be accomplished by making simultaneous measurements at ni…
PHANGS-JWST First Results: Mapping the 3.3 µm Polycyclic Aromatic Hydrocarbon Vibrational Band in Nearby Galaxies with NIRCam Medium Bands
Sandstrom, Karin M.; Bolatto, Alberto D.; Kruijssen, J. M. Diederik +28 more
We present maps of the 3.3 µm polycyclic aromatic hydrocarbon (PAH) emission feature in NGC 628, NGC 1365, and NGC 7496 as observed with the Near-Infrared Camera imager on JWST from the PHANGS-JWST Cycle 1 Treasury project. We create maps that isolate the 3.3 µm PAH feature in the F335M filter (F335MPAH) using combinations o…
Photometric binaries, mass functions, and structural parameters of 78 Galactic open clusters
Milone, Antonino P.; Vesperini, Enrico; Lagioia, Edoardo P. +8 more
Context. Binary stars play a crucial role in our understanding of the formation and evolution of star clusters and their stellar populations.
Aims: We use Gaia Data Release 3 to homogeneously analyze 78 Galactic open clusters and the unresolved binary systems they host, each composed of two main sequence (MS) stars.
Methods: We first inv…
A JWST inventory of protoplanetary disk ices. The edge-on protoplanetary disk HH 48 NE, seen with the Ice Age ERS program
van Dishoeck, E. F.; Pontoppidan, K. M.; Rocha, W. R. M. +24 more
Ices are the main carriers of volatiles in protoplanetary disks and are crucial to our understanding of the protoplanetary disk chemistry that ultimately sets the organic composition of planets. The Director's Discretionary-Early Release Science (DD-ERS) program Ice Age on the James Webb Space Telescope (JWST) follows the ice evolution through all…
ELemental abundances of Planets and brown dwarfs Imaged around Stars (ELPIS). I. Potential Metal Enrichment of the Exoplanet AF Lep b and a Novel Retrieval Approach for Cloudy Self-luminous Atmospheres
Fortney, Jonathan J.; Carter, Aarynn L.; Skemer, Andrew +10 more
AF Lep A+b is a remarkable planetary system hosting a gas-giant planet that has the lowest dynamical mass among directly imaged exoplanets. We present an in-depth analysis of the atmospheric composition of the star and planet to probe the planet's formation pathway. Based on new high-resolution spectroscopy of AF Lep A, we measure a uniform set of…
Observable Signature of Merging Stellar-mass Black Holes in Active Galactic Nuclei
Perna, Rosalba; Tagawa, Hiromichi; Kimura, Shigeo S. +2 more
The origin of stellar-mass black hole mergers discovered through gravitational waves is being widely debated. Mergers in the disks of active galactic nuclei (AGNs) represent a promising source of origin, with possible observational clues in the gravitational-wave data. Beyond gravitational waves, a unique signature of AGN-assisted mergers is elect…
Non-LTE radiative transfer with Turbospectrum
Bergemann, Maria; Hoppe, Richard; Plez, Bertrand +4 more
Physically realistic models of stellar spectra are needed in a variety of astronomical studies, from the analysis of fundamental stellar parameters, to studies of exoplanets and stellar populations in galaxies. Here we present a new version of the widely used radiative transfer code Turbospectrum, which we update so that it is able to perform spec…
Gaia Data Release 3. Hot-star radial velocities
Smith, M.; Gosset, E.; Caffau, E. +38 more
Context. The second Gaia data release, DR2, contained radial velocities of stars with effective temperatures up to Teff = 6900 K. The third data release, Gaia DR3, extends this up to Teff = 14 500 K.
Aims: We derive the radial velocities for hot stars (i.e., in the Teff = 6900 − 14 500 K range) from data obtai…
Hubble Space Telescope Transmission Spectroscopy for the Temperate Sub-Neptune TOI-270 d: A Possible Hydrogen-rich Atmosphere Containing Water Vapor
Madhusudhan, Nikku; Mikal-Evans, Thomas; Crossfield, Ian J. M. +6 more
TOI-270 d is a temperate sub-Neptune discovered by the Transiting Exoplanet Survey Satellite (TESS) around a bright (J = 9.1 mag) M3V host star. With an approximate radius of 2 R ⊕ and equilibrium temperature of 350 K, TOI-270 d is one of the most promising small exoplanets for atmospheric characterization using transit spectroscopy. He…
Two temperate Earth-mass planets orbiting the nearby star GJ 1002
Rebolo, R.; Amado, P. J.; Caballero, J. A. +43 more
We report the discovery and characterisation of two Earth-mass planets orbiting in the habitable zone of the nearby M-dwarf GJ 1002 based on the analysis of the radial-velocity (RV) time series from the ESPRESSO and CARMENES spectrographs. The host star is the quiet M5.5 V star GJ 1002 (relatively faint in the optical, V ~ 13.8 mag, but brighter i…