As part of a program to measure abundance ratios in stars beyond 15 kpc from the Galactic center, we have discovered a metal-poor star in the outer halo with a...
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PublicationA Unique Star in the Outer Halo of the Milky Way
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PublicationActive galactic nuclei and nuclear starbursts.
The Starburst model for radio-quiet Active Galactic Nuclei (AGN) postulates that the activity seen in most AGN is powered solely by young stars and compact...
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PublicationAn early-time infrared and optical study of the Type Ia Supernova 1998bu in M96
We present first-season infrared (IR) and optical photometry and spectroscopy of the Type Ia Supernova 1998bu in M96. We also report optical polarimetry of this...
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PublicationAn early-time infrared and optical study of the Type IA supernovae SN 1994D and 1991T
We present early-time infrared (IR) and optical spectroscopy, and optical photometry, of the Type Ia supernova 1994D. These observations provide the most...
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PublicationAn HST Study of the Supernovae Accompanying GRB 040924 and GRB 041006
We present the results from a Hubble Space Telescope ACS study of the supernovae (SNe) associated with gamma-ray bursts (GRBs) 040924 (z=0.86) and 041006 (z=0...
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NewsAstronomers discover first supernova explosion of a Wolf-Rayet star
An international study, with the participation of researchers from the Gran Telescopio Canarias (GTC or Grantecan) affiliated to the Instituto de Astrofísica de...
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PublicationAT 2019abn: multi-wavelength observations over the first 200 days
Context. AT 2019abn was discovered in the nearby M51 galaxy by the Zwicky Transient Facility at more than two magnitudes and around three weeks prior to its...
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PublicationCharacterizing the environments of supernovae with MUSE
We present a statistical analysis of the environments of 11 supernovae (SNe) which occurred in six nearby galaxies (z ≲ 0.016). All galaxies were observed with...
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PublicationChemical Abundances in the Secondary Star in the Black Hole Binary A0620-00
Using a high-resolution spectrum of the secondary star in the black hole binary A0620-00, we have derived the stellar parameters and veiling caused by the...