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Article
JWST/NIRCam detections of dusty subsolar-mass young stellar objects in the Small Magellanic Cloud
Low-mass stars are the most numerous stellar objects in the Universe. Before the James Webb Space Telescope (JWST), we had limited knowledge of how planetary systems around low-mass stars could form at subsola...
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Chapter and Conference Paper
An HST Study of Star Formation in Star-Burst Clusters
Using the Hubble Space Telescope, we have undertaken a systematic study of pre main sequence (PMS) stars spanning a wide range of masses ...
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Chapter and Conference Paper
Stellar Populations in the Super Star Clusters NGC 3603 and 30 Doradus
We highlight the main results of a multi-wavelenght study of the super star clusters NGC 3603 and 30 Doradus, recently observed with Wide Field Camera 3 (WFC3) on board the HST.
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Chapter and Conference Paper
A Hubble View of Star Forming Regions in the Magellanic Clouds
The Magellanic Clouds (MCs) offer an outstanding variety of young stellar associations, in which large samples of low-mass stars (with M≲1 M⊙ currently in the act of formation can be resolved and explored in deta...
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Article
Transiting extrasolar planetary candidates in the Galactic bulge
More than 200 extrasolar planets have been discovered around relatively nearby stars, primarily through the Doppler line shifts owing to reflex motions of their host stars, and more recently through transits o...
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Article
The Need for Ultraviolet to Understand the Chemical Evolution of the Universe and Cosmology.
We identify an important set of key areas where an advanced observational Ultraviolet capability would have major impact on studies of cosmology and Galaxy formation in the young Universe. Most of these are as...
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Chapter
The Need for Ultraviolet to Understand the Chemical Evolution of the Universe, and Cosmology
We identify an important set of key areas where an advanced observational Ultraviolet capability would have major impact on studies of cosmology and Galaxy formation in the young Universe. Most of these are as...
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Chapter and Conference Paper
A Decade of Radio and X-ray Observations of SN 1993J
We review ten years of radio continuum and X-ray monitoring of the Type IIb SN 1993J in M81. The supernova (SN) has been observed continuously, since only a few days after explosion, by our group with the Very...
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Chapter and Conference Paper
Detecting Primordial Stars
We discuss the expected properties of the first stellar generations in the Universe. We find that it is possible to discern truly primordial populations from the next generation of stars by measuring the metal...
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Chapter and Conference Paper
Exploring the Reionization Epoch with HST and JWST
We discuss the detectability of the sources responsible for reionization with existing and planned telescopes. Our approach is based on the number of UV photons required for reionization and depends on relativ...
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Chapter and Conference Paper
The Initial Conditions Tostar Formation: Lowmass Stars at Lowmetallicity
We have measured the present accretion rate of roughly 800 low-mass (∼ 1 . 1.4 M⊙) pre-Main Sequence stars in the field of SN 1987A in the Large Magellanic Cloud.
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Chapter and Conference Paper
A Geometric Determination of the Distance to SN 1987A and the LMC
Using the definitive reductions of the IUE light curves by [15] and an extensive set of HST images of SN 1987A we have repeated and improved our original analysis [8, 9] to derive a better determination of the di...
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Chapter and Conference Paper
Radio Monitoring of Supernova 2001ig: The First Year
Supernova 2001ig in NGC 7424 has been observed with the Australia Telescope Compact Array at ∼2 week intervals since its discovery, making this the best-studied Type IIb radio supernova since SN 1993J.We prese...
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Chapter and Conference Paper
Radio Supernovae
Detailed, multi-frequency radio observations of supernovae have shown that the radio emission can be understood as a blastwave interacting with a structured circumstellar medium (CSM) and modeling of the radio...
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Article
An energetic stellar outburst accompanied by circumstellar light echoes
Some classes of stars, including novae and supernovae, undergo explosive outbursts that eject stellar material into space. In 2002, the previously unknown variable star V838 Monocerotis brightened suddenly by ...
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Chapter
Radio Observations of γ-Ray Burst Afterglows
Since 1997 the afterglow of γ-ray bursting sources (GRBs) has occasionally been detected in the radio, as well in other wavelengths bands. In particular, the interesting and unusual γ-ray burst GRB980425, thou...
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Chapter
Ultraviolet Supernovae
The observations of supernovae made with IUE and HST are reviewed and discussed. The various supernova types are characterized and discussed in the light of their ultraviolet properties. Special emphasis is place...
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Chapter and Conference Paper
T Tauri Stars in the Large Magellanic Cloud: A Combined HST and VLT Effort
The combination of the unprecedented spatial resolution attainable with WFPC2 on board HST and of the large collecting area of the VLT makes it possible to study in detail the low mass pre-Main Sequence stars ...
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Chapter and Conference Paper
T Tauri Stars in the Large Magellanic Cloud: A Combined HST and VLT Effort
The combination of the unprecedented spatial resolution attainable with WFPC2 on board HST and of the large collecting area of the VLT makes it possible to study in detail the low mass pre-Main Sequence stars ...
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Article
Gravitational microlensing by low-mass objects in the globular cluster M22
Gravitational microlensing offers a means of determining directly the masses of objects ranging from planets to stars, provided that the distances and motions of the lenses and sources can be determined1,2. A glo...
