Search Publications
A long-period radio transient active for three decades
de Martino, D.; Heywood, I.; Rea, N. +22 more
Several long-period radio transients have recently been discovered, with strongly polarized coherent radio pulses appearing on timescales between tens to thousands of seconds1,2. In some cases, the radio pulses have been interpreted as coming from rotating neutron stars with extremely strong magnetic fields, known as magnetars; the orig…
Detection of phosphates originating from Enceladus's ocean
Postberg, Frank; Sekine, Yasuhito; Glein, Christopher R. +13 more
Saturn's moon Enceladus harbours a global1 ice-covered water ocean2,3. The Cassini spacecraft investigated the composition of the ocean by analysis of material ejected into space by the moon's cryovolcanic plume4-9. The analysis of salt-rich ice grains by Cassini's Cosmic Dust Analyzer10 enabled inferenc…
CATS: The Hubble Constant from Standardized TRGB and Type Ia Supernova Measurements
Li, S.; Dhawan, S.; Anderson, R. I. +7 more
The tip of the red giant branch (TRGB) provides a luminous standard candle for constructing distance ladders to measure the Hubble constant. In practice, its measurements via edge-detection response (EDR) are complicated by the apparent fuzziness of the tip and the multipeak landscape of the EDR. Previously, we optimized an unsupervised algorithm,…
Gaia Data Release 3. A golden sample of astrophysical parameters
Prusti, T.; Mazeh, T.; Zucker, S. +446 more
Context.Gaia Data Release 3 (DR3) provides a wealth of new data products for the astronomical community to exploit, including astrophysical parameters for half a billion stars. In this work, we demonstrate the high quality of these data products and illustrate their use in different astrophysical contexts.
Aims: We produce homogeneous samples…
Precision Modeling of JWST's First Cluster Lens SMACS J0723.3-7327
Mahler, Guillaume; Richard, Johan; Kneib, Jean-Paul +12 more
Exploiting the fundamentally achromatic nature of gravitational lensing, we present a lens model for the massive galaxy cluster SMACS J0723.3-7323 (SMACS J0723; z = 0.388) that significantly improves upon earlier work. Building on strong-lensing constraints identified in prior Hubble Space Telescope (HST) observations, the mass model utilizes 21 m…
Sizes and Mass Profiles of Candidate Massive Galaxies Discovered by JWST at 7 < z < 9: Evidence for Very Early Formation of the Central 100 pc of Present-day Ellipticals
Labbé, Ivo; van Dokkum, Pieter; Bezanson, Rachel +8 more
The first JWST data revealed an unexpected population of red galaxies that appear to have redshifts of z ~ 7-9 and high masses of M * ≳ 1010 M ☉. Here we fit Sérsic profiles to the F200W NIRCam images of the 13 massive galaxy candidates of Labbé et al., to determine their structural parameters. Satisfactory fits we…
Far-ultraviolet to Near-infrared Observations of SN 2023ixf: A High-energy Explosion Engulfed in Complex Circumstellar Material
Kawabata, Koji S.; Pathak, Utkarsh; Kumar, Brajesh +13 more
We present early-phase panchromatic photometric and spectroscopic coverage spanning the far-ultraviolet to near-infrared regime of the nearest hydrogen-rich core-collapse supernova (SN) in the last 25 yr, SN 2023ixf. We observe early "flash" features in the optical spectra due to confined dense circumstellar material (CSM). We observe high-ionizat…
Free-floating Planet Mass Function from MOA-II 9 yr Survey toward the Galactic Bulge
Fukui, Akihiko; Sumi, Takahiro; Bond, Ian A. +25 more
We present the first measurement of the mass function of free-floating planets (FFPs), or very wide orbit planets down to an Earth mass, from the MOA-II microlensing survey in 2006-2014. Six events are likely to be due to planets with Einstein radius crossing times t E < 0.5 days, and the shortest has t E = 0.057 ± 0.016 d…
Early Results From GLASS-JWST. XII. The Morphology of Galaxies at the Epoch of Reionization
Vulcani, B.; Treu, T.; Castellano, M. +23 more
Star-forming galaxies can exhibit strong morphological differences between the rest-frame far-UV and optical, reflecting inhomogeneities in star formation and dust attenuation. We exploit deep, high-resolution, NIRCAM seven-band observations to take a first look at the morphology of galaxies in the epoch of reionization (z > 7), and its variati…
Water in the terrestrial planet-forming zone of the PDS 70 disk
Waters, L. B. F. M.; Olofsson, G.; Abergel, A. +42 more
Terrestrial and sub-Neptune planets are expected to form in the inner (less than 10 AU) regions of protoplanetary disks1. Water plays a key role in their formation2-4, although it is yet unclear whether water molecules are formed in situ or transported from the outer disk5,6. So far Spitzer Space Telescope observat…