The Astrophysical Journal Supplement Series (Jan 2024)
1991T-like Supernovae
- M. M. Phillips,
- C. Ashall,
- Peter J. Brown,
- L. Galbany,
- M. A. Tucker,
- Christopher R. Burns,
- Carlos Contreras,
- P. Hoeflich,
- E. Y. Hsiao,
- S. Kumar,
- Nidia Morrell,
- Syed A. Uddin,
- E. Baron,
- Wendy L. Freedman,
- Kevin Krisciunas,
- S. E. Persson,
- Anthony L. Piro,
- B. J. Shappee,
- Maximilian Stritzinger,
- Nicholas B. Suntzeff,
- Sudeshna Chakraborty,
- R. P. Kirshner,
- J. Lu,
- G. H. Marion,
- Abigail Polin,
- M. Shahbandeh
Affiliations
- M. M. Phillips
- ORCiD
- Carnegie Observatories, Las Campanas Observatory , Casilla 601, La Serena, Chile
- C. Ashall
- ORCiD
- Department of Physics, Virginia Polytechnic Institute and State University , 850 West Campus Drive, Blacksburg, VA 24061, USA
- Peter J. Brown
- ORCiD
- George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, Texas A&M University , Department of Physics and Astronomy, College Station, TX 77843, USA
- L. Galbany
- ORCiD
- Institute of Space Sciences (ICE, CSIC) , Campus UAB, Carrer de Can Magrans, s/n, E-08193 Barcelona, Spain; Institut d’Estudis Espacials de Catalunya (IEEC) , E-08034 Barcelona, Spain
- M. A. Tucker
- ORCiD
- Center for Cosmology and Astroparticle Physics, The Ohio State University , 191 West Woodruff Avenue, Columbus, OH, USA; Department of Astronomy, The Ohio State University , 140 West 18th Avenue, Columbus, OH, USA; Department of Physics, The Ohio State University , 191 West Woodruff Avenue, Columbus, OH, USA
- Christopher R. Burns
- ORCiD
- Observatories of the Carnegie Institution for Science , 813 Santa Barbara Street, Pasadena, CA 91101, USA
- Carlos Contreras
- ORCiD
- Carnegie Observatories, Las Campanas Observatory , Casilla 601, La Serena, Chile
- P. Hoeflich
- ORCiD
- Department of Physics, Florida State University , 77 Chieftan Way, Tallahassee, FL 32306, USA
- E. Y. Hsiao
- ORCiD
- Department of Physics, Florida State University , 77 Chieftan Way, Tallahassee, FL 32306, USA
- S. Kumar
- ORCiD
- Department of Physics, Florida State University , 77 Chieftan Way, Tallahassee, FL 32306, USA; Department of Astronomy, University of Virginia , 530 McCormick Road, Charlottesville, VA 22904, USA
- Nidia Morrell
- ORCiD
- Carnegie Observatories, Las Campanas Observatory , Casilla 601, La Serena, Chile
- Syed A. Uddin
- ORCiD
- George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, Texas A&M University , Department of Physics and Astronomy, College Station, TX 77843, USA
- E. Baron
- ORCiD
- Planetary Science Institute , 1700 East Fort Lowell Road, Suite 106, Tucson, AZ 85719-2395, USA; Hamburger Sternwarte , Gojenbergsweg 112, D-21029 Hamburg, Germany; Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma , 440 W. Brooks, Rm 100, Norman, OK 73019-2061, USA
- Wendy L. Freedman
- ORCiD
- Department of Astronomy and Astrophysics, University of Chicago , 5640 S. Ellis Avenue, Chicago, IL 60637, USA
- Kevin Krisciunas
- ORCiD
- George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, Texas A&M University , Department of Physics and Astronomy, College Station, TX 77843, USA
- S. E. Persson
- ORCiD
- Observatories of the Carnegie Institution for Science , 813 Santa Barbara Street, Pasadena, CA 91101, USA
- Anthony L. Piro
- ORCiD
- Observatories of the Carnegie Institution for Science , 813 Santa Barbara Street, Pasadena, CA 91101, USA
- B. J. Shappee
- ORCiD
- Institute for Astronomy, University of Hawai‘i at Mānoa , 2680 Woodlawn Drive, Honolulu, HI, USA
- Maximilian Stritzinger
- ORCiD
- Department of Physics and Astronomy, Aarhus University , Ny Munkegade 120, DK-8000 Aarhus C, Denmark
- Nicholas B. Suntzeff
- ORCiD
- George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, Texas A&M University , Department of Physics and Astronomy, College Station, TX 77843, USA
- Sudeshna Chakraborty
- ORCiD
- Department of Physics, Florida State University , 77 Chieftan Way, Tallahassee, FL 32306, USA
- R. P. Kirshner
- ORCiD
- Gordon and Betty Moore Foundation , 1661 Page Mill Road, Palo Alto, CA 94304, USA; Harvard-Smithsonian Center for Astrophysics , 60 Garden Street, Cambridge, MA 02138, USA
- J. Lu
- ORCiD
- Department of Physics, Florida State University , 77 Chieftan Way, Tallahassee, FL 32306, USA
- G. H. Marion
- ORCiD
- University of Texas at Austin , 1 University Station C1400, Austin, TX 78712-0259, USA
- Abigail Polin
- ORCiD
- Observatories of the Carnegie Institution for Science , 813 Santa Barbara Street, Pasadena, CA 91101, USA; TAPIR, Walter Burke Institute for Theoretical Physics , Caltech, 1200 East California Boulevard, Pasadena, CA 91125, USA
- M. Shahbandeh
- ORCiD
- Department of Physics, Florida State University , 77 Chieftan Way, Tallahassee, FL 32306, USA
- DOI
- https://doi.org/10.3847/1538-4365/ad4f7e
- Journal volume & issue
-
Vol. 273,
no. 1
p. 16
Abstract
Understanding the nature of the luminous 1991T-like supernovae (SNe) is of great importance to SN cosmology as they are likely to have been more common in the early Universe. In this paper, we explore the observational properties of 1991T-like SNe to study their relationship to other luminous, slow-declining Type Ia supernovae (SNe Ia). From the spectroscopic and photometric criteria defined in Phillips et al., we identify 17 1991T-like SNe from the literature. Combining these objects with 10 1991T-like SNe from the Carnegie Supernova Project-II, the spectra, light curves, and colors of these events, along with their host galaxy properties, are examined in detail. We conclude that 1991T-like SNe are closely related in essentially all of their UV, optical, and near-infrared properties—as well as their host galaxy parameters—to the slow-declining subset of Branch core-normal SNe and to the intermediate 1999aa-like events, forming a continuum of luminous SNe Ia. The overriding difference between these three subgroups appears to be the extent to which ^56 Ni mixes into the ejecta, producing the premaximum spectra dominated by Fe iii absorption, the broader UV light curves, and the higher luminosities that characterize the 1991T-like events. Nevertheless, the association of 1991T-like SNe with the rare Type Ia circumstellar material SNe would seem to run counter to this hypothesis, in which case 1991T-like events may form a separate subclass of SNe Ia, possibly arising from single-degenerate progenitor systems.
Keywords
