ORCID Profile
0000-0002-6839-4881
Current Organisation
NSF's NOIRLab
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Publisher: American Astronomical Society
Date: 12-1998
DOI: 10.1086/306443
Publisher: American Astronomical Society
Date: 25-01-2010
Publisher: American Astronomical Society
Date: 29-06-2012
Publisher: American Astronomical Society
Date: 10-11-1998
DOI: 10.1086/306364
Publisher: American Astronomical Society
Date: 23-07-2010
Publisher: American Astronomical Society
Date: 20-01-2021
Publisher: American Astronomical Society
Date: 15-03-2007
DOI: 10.1086/516711
Publisher: American Astronomical Society
Date: 07-1998
DOI: 10.1086/305808
Publisher: American Astronomical Society
Date: 03-2003
DOI: 10.1086/346279
Publisher: American Astronomical Society
Date: 11-02-2011
Publisher: American Astronomical Society
Date: 17-08-2010
Publisher: American Astronomical Society
Date: 11-01-2011
Publisher: American Astronomical Society
Date: 06-2002
DOI: 10.1086/340356
Publisher: American Astronomical Society
Date: 16-10-2018
Publisher: American Astronomical Society
Date: 25-08-2010
Publisher: American Astronomical Society
Date: 12-06-2012
Publisher: American Astronomical Society
Date: 02-08-2022
Abstract: We report on the observations, analysis and interpretation of the microlensing event MOA-2019-BLG-008. The observed anomaly in the photometric light curve is best described through a binary lens model. In this model, the source did not cross caustics and no finite-source effects were observed. Therefore, the angular Einstein ring radius θ E cannot be measured from the light curve alone. However, the large event duration, t E ∼ 80 days, allows a precise measurement of the microlensing parallax π E . In addition to the constraints on the angular radius θ * and the apparent brightness I s of the source, we employ the Besançon and GalMod galactic models to estimate the physical properties of the lens. We find excellent agreement between the predictions of the two galactic models: the companion is likely a resident of the brown dwarf desert with a mass M p ∼ 30 M Jup , and the host is a main-sequence dwarf star. The lens lies along the line of sight to the Galactic bulge, at a distance of ≤4 kpc. We estimate that in about 10 yr the lens and source will be separated by ∼55 mas, and it will be possible to confirm the exact nature of the lensing system by using high-resolution imaging from ground- or space-based observatories.
Publisher: Springer Science and Business Media LLC
Date: 13-04-2010
Publisher: American Astronomical Society
Date: 20-06-1998
DOI: 10.1086/305766
Publisher: American Astronomical Society
Date: 15-09-2003
DOI: 10.1086/379157
Publisher: American Astronomical Society
Date: 22-03-2011
Publisher: American Astronomical Society
Date: 11-2022
Abstract: We verified for photometric stability a set of DA white dwarfs with Hubble Space Telescope magnitudes from the near-ultraviolet to the near-infrared and ground-based spectroscopy by using time-spaced observations from the Las Cumbres Observatory network of telescopes. The initial list of 38 stars was whittled to 32 final ones, which comprise a high-quality set of spectrophotometric standards. These stars are homogeneously distributed around the sky and are all fainter than r ∼ 16.5 mag. Their distribution is such that at least two of them would be available to be observed from any observatory on the ground at any time at airmass less than 2. Light curves and different variability indices from the Las Cumbres Observatory data were used to determine the stability of the candidate standards. When available, Pan-STARRS1, Zwicky Transient Facility, and TESS data were also used to confirm the star classification. Our analysis showed that four DA white dwarfs may exhibit evidence of photometric variability, while a fifth is cooler than our established lower temperature limit, and a sixth star might be a binary. In some instances, due to the presence of faint nearby red sources, care should be used when observing a few of the spectrophotometric standards with ground-based telescopes. Light curves and finding charts for all the stars are provided.
Publisher: American Astronomical Society
Date: 10-10-2003
DOI: 10.1086/377635
Publisher: American Astronomical Society
Date: 23-04-2015
Publisher: American Astronomical Society
Date: 20-09-1998
DOI: 10.1086/306150
Publisher: American Astronomical Society
Date: 19-04-2016
Publisher: American Astronomical Society
Date: 20-02-2013
Publisher: American Astronomical Society
Date: 09-2011
Publisher: EDP Sciences
Date: 11-03-2011
Publisher: American Astronomical Society
Date: 06-0005
DOI: 10.1086/305538
Publisher: Elsevier BV
Date: 06-1998
DOI: 10.1016/S0305-4179(98)00026-6
Abstract: Two companies provide custom-made pressure garments to clients with burn scars at Westmead Hospital. This prospective study was completed in order to make objective decisions about which garments were most appropriate and cost effective to provide to clients. Issues such as cost, durability, fit and client preferences were investigated. Data were collected from 43 clients at the time of initial fitting, at a follow-up appointment 4-6 weeks later, and at the time one of the garments required replacement. One Second Skin and one Jobst garment were provided to each client and the garments were compared using therapists' evaluation and clients' perspectives on a number of variables. Second Skin garments had significantly more favourable results on the variables of time for delivery, fit at follow-up, garment design, quality of fabric and seams, overall satisfaction and garment preference for ongoing wear. On all other variables there was no significant difference between the garments. Second Skin provided the most optimal and appropriate option for pressure garments in the management of burn scars for our clients.
Publisher: American Astronomical Society
Date: 28-03-2019
Publisher: American Astronomical Society
Date: 07-2003
DOI: 10.1086/375761
Publisher: American Astronomical Society
Date: 25-10-2017
Publisher: American Astronomical Society
Date: 16-03-2011
Publisher: American Astronomical Society
Date: 07-06-2011
Publisher: American Astronomical Society
Date: 02-2002
DOI: 10.1086/324635
Publisher: American Astronomical Society
Date: 22-12-2021
Abstract: Vera C. Rubin Observatory is a ground-based astronomical facility under construction, a joint project of the National Science Foundation and the U.S. Department of Energy, designed to conduct a multipurpose 10 yr optical survey of the Southern Hemisphere sky: the Legacy Survey of Space and Time. Significant flexibility in survey strategy remains within the constraints imposed by the core science goals of probing dark energy and dark matter, cataloging the solar system, exploring the transient optical sky, and mapping the Milky Way. The survey’s massive data throughput will be transformational for many other astrophysics domains and Rubin’s data access policy sets the stage for a huge community of potential users. To ensure that the survey science potential is maximized while serving as broad a community as possible, Rubin Observatory has involved the scientific community at large in the process of setting and refining the details of the observing strategy. The motivation, history, and decision-making process of this strategy optimization are detailed in this paper, giving context to the science-driven proposals and recommendations for the survey strategy included in this Focus Issue.
Location: United States of America
No related grants have been discovered for ABHIJIT SAHA.