Search Publications
Far-UV HST Spectroscopy of an Unusual Hydrogen-poor Superluminous Supernova: SN2017egm
Brown, P. J.; Quimby, R.; Lunnan, R. +4 more
SN2017egm is the closest (z = 0.03) H-poor superluminous supernova (SLSN-I) detected to date, and a rare example of an SLSN-I in a massive, metal-rich galaxy. We present the HST UV and optical spectra covering 1000-5500 Å, taken at +3 day relative to the peak. Our data reveal two absorption systems at redshifts matching the host galaxy NGC 3191 (z…
Progenitor Mass Distribution for Core-collapse Supernova Remnants in M31 and M33
Dolphin, Andrew E.; Williams, Benjamin F.; Dalcanton, Julianne J. +3 more
Using the star formation histories (SFHs) near 94 supernova remnants (SNRs), we infer the progenitor mass distribution for core-collapse supernovae. We use Bayesian inference and model each SFH with multiple bursts of star formation (SF), one of which is assumed to be associated with the SNR. Assuming single-star evolution, the minimum mass of CCS…
The infrared-radio correlation of spheroid- and disc-dominated star-forming galaxies to z ∼ 1.5 in the COSMOS field
Zamorani, Giovanni; Schinnerer, Eva; Murphy, Eric J. +14 more
Using infrared data from the Herschel Space Observatory and Karl G. Jansky Very Large Array 3 GHz observations in the COSMOS field, we investigate the redshift evolution of the infrared-radio correlation (IRRC) for star-forming galaxies (SFGs) we classify as either spheroid- or disc-dominated based on their morphology. The sample predominantly con…
Host galaxies of SNe Ic-BL with and without long gamma-ray bursts
Salvaterra, R.; Kaper, L.; Renzo, M. +5 more
Broad-line Ic supernovae (SNe Ic-BL) are a very rare class of core-collapse supernovae exhibiting high ejecta velocities and high kinetic energies. They are the only type of SNe that accompany long gamma-ray burst (GRB) explosions. Systematic differences found in the spectra of SNe Ic-BL with and without GRBs (GRB-SNe and SNe Ic-BL, respectively) …
Direct Imaging of the HD 35841 Debris Disk: A Polarized Dust Ring from Gemini Planet Imager and an Outer Halo from HST/STIS
Duchêne, Gaspard; Esposito, Thomas M.; Oppenheimer, Rebecca +55 more
We present new high resolution imaging of a light-scattering dust ring and halo around the young star HD 35841. Using spectroscopic and polarimetric data from the Gemini Planet Imager in H-band (1.6 µm), we detect the highly inclined (i = 85°) ring of debris down to a projected separation of ∼12 au (∼0.″12) for the first time. Optical imagin…
Discovery of a Transiting Adolescent Sub-Neptune Exoplanet with K2
Vanderburg, Andrew; Bieryla, Allyson; Latham, David W. +19 more
The role of stellar age in the measured properties and occurrence rates of exoplanets is not well understood. This is in part due to a paucity of known young planets and the uncertainties in age-dating for most exoplanet host stars. Exoplanets with well-constrained ages, particularly those which are young, are useful as benchmarks for studies aimi…
Evolution of spatially resolved star formation main sequence and surface density profiles in massive disc galaxies at 0 ≲ z ≲ 1: inside-out stellar mass buildup and quenching
Abdurro'uf; Akiyama, Masayuki
We investigate a relation between surface densities of star formation rate (SFR) and stellar mass (M*) at a ∼1 kpc scale namely spatially resolved star formation main sequence (SFMS) in massive (log (M*/M⊙) > 10.5) face-on disc galaxies at 0.01 < z < 0.02 and 0.8 < z < 1.8 and examine evolution of th…
The envelope of the power spectra of over a thousand δ Scuti stars. The T̅eff - νmax scaling relation
García, R. A.; Roca Cortés, T.; Barceló Forteza, S.
CoRoT and Kepler high-precision photometric data allowed the detection and characterization of the oscillation parameters in stars other than the Sun. Moreover, thanks to the scaling relations, it is possible to estimate masses and radii for thousands of solar-type oscillating stars. Recently, a Δν - ρ relation has been found for δ Scuti stars. No…
Upper Limits on the Presence of Central Massive Black Holes in Two Ultra-compact Dwarf Galaxies in Centaurus A
Romanowsky, Aaron J.; Neumayer, Nadine; Strader, Jay +10 more
The recent discovery of massive black holes (BHs) in the centers of high-mass ultra-compact dwarf galaxies (UCDs) suggests that at least some are the stripped nuclear star clusters of dwarf galaxies. We present the first study that investigates whether such massive BHs, and therefore stripped nuclei, also exist in low-mass (M < 107 M…
The Rest-frame Optical Sizes of Massive Galaxies with Suppressed Star Formation at z ∼ 4
Toft, Sune; Kubo, Mariko; Tanaka, Masayuki +3 more
We present the rest-frame optical sizes of massive quiescent galaxies (QGs) at z ∼ 4 measured at the K‧-band with the Infrared Camera and Spectrograph and adaptive optics (AO) facility, AO188, on the Subaru telescope. Based on a deep multiwavelength catalog in the Subaru XMM-Newton Deep Survey Field, covering a wide wavelength range from the u-ban…