Search for: All records

Creators/Authors contains: "Uddin, Syed A."

« Prev Next »

Total Resources

3

Resource Type
Conference Paper

0

Conference Proceeding

0

Dataset

0

Journal Article

3

Workshop Report

0

Availability
Full Text / Resource Available

3

Citation Only

0

Save Results
Excel (limit 2000)
CSV (limit 5000)
XML (limit 5000)

Have feedback or suggestions for a way to improve these results?
!

Note: When clicking on a Digital Object Identifier (DOI) number, you will be taken to an external site maintained by the publisher. Some full text articles may not yet be available without a charge during the embargo (administrative interval).
What is a DOI Number?

Some links on this page may take you to non-federal websites. Their policies may differ from this site.

The Absolute Magnitudes of 1991T-like Supernovae *

https://doi.org/10.3847/1538-4357/ac9305

Phillips, M. M. ; Ashall, C. ; Burns, Christopher R. ; Contreras, Carlos ; Galbany, L. ; Hoeflich, P. ; Hsiao, E. Y. ; Morrell, Nidia ; Nugent, Peter ; Uddin, Syed A. ; et al ( October 2022 , The Astrophysical Journal)

Abstract
1991T-like supernovae are the luminous, slow-declining extreme of the Branch shallow-silicon (SS) subclass of Type Ia supernovae. They are distinguished by extremely weak CaiiH & K and Siiiλ6355 and strong Feiiiabsorption features in their optical spectra at pre-maximum phases, and have long been suspected to be over-luminous compared to normal Type Ia supernovae. In this paper, the pseudo-equivalent width of the Siiiλ6355 absorption obtained at light curve phases from ≤ +10 days is combined with the morphology of thei-band light curve to identify a sample of 1991T-like supernovae in the Carnegie Supernova Project II. Hubble diagram residuals show that, at optical as well as near-infrared wavelengths, these events are over-luminous by ∼0.1–0.5 mag with respect to the less extreme Branch SS (1999aa-like) and Branch core-normal supernovae with similarB-band light-curve decline rates.

more » « less
The Carnegie Supernova Project-I: Correlation between Type Ia Supernovae and Their Host Galaxies from Optical to Near-infrared Bands

https://doi.org/10.3847/1538-4357/abafb7

Uddin, Syed A ; Burns, Christopher R. ; Phillips, M. M. ; Suntzeff, Nicholas B. ; Contreras, Carlos ; Hsiao, Eric Y. ; Morrell, Nidia ; Galbany, Lluís ; Stritzinger, Maximilian ; Hoeflich, Peter ; et al ( October 2020 , The Astrophysical Journal)
null (Ed.)
Full Text Available
Carnegie Supernova Project-II: Extending the Near-infrared Hubble Diagram

Phillips, M. M. ; Contreras, Carlos ; Hsiao, E. Y. ; Morrell, Nidia ; Burns, Christopher R. ; Stritzinger, Maximilian ; Ashall, C. ; Freedman, Wendy L. ; Hoeflich, P. ; Persson, S. E. ; et al ( January 2019 , Publications of the Astronomical Society of the Pacific)

The Carnegie Supernova Project-II (CSP-II) was an NSF-funded, four-year program to obtain optical and near-infrared observations of a “Cosmology” sample of ˜100 Type Ia supernovae located in the smooth Hubble flow (0.03 ≲ z ≲ 0.10). Light curves were also obtained of a “Physics” sample composed of 90 nearby Type Ia supernovae at z ≤ 0.04 selected for near-infrared spectroscopic timeseries observations. The primary emphasis of the CSP-II is to use the combination of optical and near-infrared photometry to achieve a distance precision of better than 5%. In this paper, details of the supernova sample, the observational strategy, and the characteristics of the photometric data are provided. In a companion paper, the near-infrared spectroscopy component of the project is presented.
more » « less
Full Text Available