The Astrophysical Journal (Jan 2023)
The Origin and Evolution of the Normal Type Ia SN 2018aoz with Infant-phase Reddening and Excess Emission
- Yuan Qi Ni,
- Dae-Sik Moon,
- Maria R. Drout,
- Abigail Polin,
- David J. Sand,
- Santiago González-Gaitán,
- Sang Chul Kim,
- Youngdae Lee,
- Hong Soo Park,
- D. Andrew Howell,
- Peter E. Nugent,
- Anthony L. Piro,
- Peter J. Brown,
- Lluís Galbany,
- Jamison Burke,
- Daichi Hiramatsu,
- Griffin Hosseinzadeh,
- Stefano Valenti,
- Niloufar Afsariardchi,
- Jennifer E. Andrews,
- John Antoniadis,
- Rachael L. Beaton,
- K. Azalee Bostroem,
- Raymond G. Carlberg,
- S. Bradley Cenko,
- Sang-Mok Cha,
- Yize Dong,
- Avishay Gal-Yam,
- Joshua Haislip,
- Thomas W.-S. Holoien,
- Sean D. Johnson,
- Vladimir Kouprianov,
- Yongseok Lee,
- Christopher D. Matzner,
- Nidia Morrell,
- Curtis McCully,
- Giuliano Pignata,
- Daniel E. Reichart,
- Jeffrey Rich,
- Stuart D. Ryder,
- Nathan Smith,
- Samuel Wyatt,
- Sheng Yang
Affiliations
- Yuan Qi Ni
- ORCiD
- David A. Dunlap Department of Astronomy and Astrophysics, University of Toronto , 50 St George Street, Toronto, ON M5S 3H4, Canada [email protected]
- Dae-Sik Moon
- ORCiD
- David A. Dunlap Department of Astronomy and Astrophysics, University of Toronto , 50 St George Street, Toronto, ON M5S 3H4, Canada [email protected]
- Maria R. Drout
- ORCiD
- David A. Dunlap Department of Astronomy and Astrophysics, University of Toronto , 50 St George Street, Toronto, ON M5S 3H4, Canada [email protected]
- Abigail Polin
- ORCiD
- The 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
- David J. Sand
- ORCiD
- Department of Astronomy/Steward Observatory, University of Arizona , 933 North Cherry Avenue, Rm. N204, Tucson, AZ 85721-0065, USA
- Santiago González-Gaitán
- ORCiD
- CENTRA, Instituto Superior Técnico, Universidade de Lisboa , Avenida Rovisco Pais, 1049-001 Lisboa, Portugal
- Sang Chul Kim
- ORCiD
- Korea Astronomy and Space Science Institute , 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea; Korea University of Science and Technology (UST) , 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea
- Youngdae Lee
- ORCiD
- Korea Astronomy and Space Science Institute , 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea; Department of Astronomy and Space Science, Chungnam National University , 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
- Hong Soo Park
- ORCiD
- Department of Astronomy/Steward Observatory, University of Arizona , 933 North Cherry Avenue, Rm. N204, Tucson, AZ 85721-0065, USA; Korea Astronomy and Space Science Institute , 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea; Korea University of Science and Technology (UST) , 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea
- D. Andrew Howell
- ORCiD
- Department of Physics, University of California , Santa Barbara, CA 93106-9530, USA; Las Cumbres Observatory , 6740 Cortona Drive, Suite 102, Goleta, CA 93117-5575, USA
- Peter E. Nugent
- ORCiD
- Lawrence Berkeley National Laboratory , 1 Cyclotron Road, 1 Berkeley, CA 94720-8197, USA; Department of Physics and Astronomy, University of California Berkeley , Berkeley, CA 94720 USA
- Anthony L. Piro
- ORCiD
- The Observatories of the Carnegie Institution for Science , 813 Santa Barbara Street, Pasadena, CA 91101, USA
- Peter J. Brown
- ORCiD
- Department of Physics and Astronomy, Texas A&M University , 4242 TAMU, College Station, TX 77843-4242, USA; George P. and Cynthia Woods Mitchell Institute for Fundamental Physics & Astronomy , College Station, TX 77843, USA
- Lluís 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
- Jamison Burke
- ORCiD
- Department of Physics, University of California , Santa Barbara, CA 93106-9530, USA; Las Cumbres Observatory , 6740 Cortona Drive, Suite 102, Goleta, CA 93117-5575, USA
- Daichi Hiramatsu
- ORCiD
- Department of Physics, University of California , Santa Barbara, CA 93106-9530, USA; Las Cumbres Observatory , 6740 Cortona Drive, Suite 102, Goleta, CA 93117-5575, USA; Center for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138-1516, USA; The NSF AI Institute for Artificial Intelligence and Fundamental Interactions , Cambridge, MA 02139, USA
- Griffin Hosseinzadeh
- ORCiD
- Department of Astronomy/Steward Observatory, University of Arizona , 933 North Cherry Avenue, Rm. N204, Tucson, AZ 85721-0065, USA
- Stefano Valenti
- ORCiD
- Department of Physics and Astronomy, University of California Davis , 1 Shields Avenue, Davis, CA 95616-5270, USA
- Niloufar Afsariardchi
- ORCiD
- David A. Dunlap Department of Astronomy and Astrophysics, University of Toronto , 50 St George Street, Toronto, ON M5S 3H4, Canada [email protected]
- Jennifer E. Andrews
- ORCiD
- Department of Astronomy/Steward Observatory, University of Arizona , 933 North Cherry Avenue, Rm. N204, Tucson, AZ 85721-0065, USA
- John Antoniadis
- ORCiD
- Institute of Astrophysics, FORTH, Department of Physics, University of Crete , Voutes, University Campus, GR-71003 Heraklion, Greece; Max-Planck Institut für Radioastronomie , Auf dem Hügel 69, 53121 Bonn, Germany; Argelander Institut für Astronomie , Auf dem Hügel 71, 53121 Bonn, Germany
- Rachael L. Beaton
- ORCiD
- The Observatories of the Carnegie Institution for Science , 813 Santa Barbara Street, Pasadena, CA 91101, USA; Department of Astrophysical Sciences, Princeton University , 4 Ivy Lane, Princeton, NJ 08544, USA
- K. Azalee Bostroem
- ORCiD
- DIRAC Institute, Department of Astronomy, University of Washington , 3910 15th Avenue NE, Seattle, WA 98195, USA
- Raymond G. Carlberg
- ORCiD
- David A. Dunlap Department of Astronomy and Astrophysics, University of Toronto , 50 St George Street, Toronto, ON M5S 3H4, Canada [email protected]
- S. Bradley Cenko
- ORCiD
- Astrophysics Science Division, NASA Goddard Space Flight Center , MC 661, Greenbelt, MD 20771, USA; Joint Space-Science Institute, University of Maryland , College Park, MD 20742, USA
- Sang-Mok Cha
- ORCiD
- Korea Astronomy and Space Science Institute , 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea; School of Space Research, Kyunghee University , 1732 Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 17104, Republic of Korea
- Yize Dong
- ORCiD
- Department of Physics and Astronomy, University of California Davis , 1 Shields Avenue, Davis, CA 95616-5270, USA
- Avishay Gal-Yam
- ORCiD
- Department of Particle Physics and Astrophysics, Weizmann Institute of Science , 234 Herzl Street, Rehovot 76100, Israel
- Joshua Haislip
- ORCiD
- Department of Physics and Astronomy, University of North Carolina at Chapel Hill , 120 E. Cameron Avenue, Chapel Hill, NC 27599-3255, USA
- Thomas W.-S. Holoien
- ORCiD
- The Observatories of the Carnegie Institution for Science , 813 Santa Barbara Street, Pasadena, CA 91101, USA
- Sean D. Johnson
- ORCiD
- Department of Astrophysical Sciences, Princeton University , 4 Ivy Lane, Princeton, NJ 08544, USA
- Vladimir Kouprianov
- ORCiD
- Department of Physics and Astronomy, University of North Carolina at Chapel Hill , 120 E. Cameron Avenue, Chapel Hill, NC 27599-3255, USA; Central (Pulkovo) Observatory of Russian Academy of Sciences , 196140 Pulkovskoye Avenue 65/1, Saint Petersburg, Russia
- Yongseok Lee
- ORCiD
- Korea Astronomy and Space Science Institute , 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea; School of Space Research, Kyunghee University , 1732 Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 17104, Republic of Korea
- Christopher D. Matzner
- ORCiD
- David A. Dunlap Department of Astronomy and Astrophysics, University of Toronto , 50 St George Street, Toronto, ON M5S 3H4, Canada [email protected]
- Nidia Morrell
- ORCiD
- Las Campanas Observatory, Carnegie Observatories , Casilla 601, La Serena, Chile
- Curtis McCully
- ORCiD
- Department of Physics, University of California , Santa Barbara, CA 93106-9530, USA; Las Cumbres Observatory , 6740 Cortona Drive, Suite 102, Goleta, CA 93117-5575, USA
- Giuliano Pignata
- ORCiD
- Departamento de Ciencias Fisicas, Universidad Andres Bello , Avenida República 252, Santiago, 8370134, Chile; Millennium Institute of Astrophysics (MAS) , Nuncio Monseñor Sotero Sanz 100, Providencia, Santiago, Chile
- Daniel E. Reichart
- ORCiD
- Department of Physics and Astronomy, University of North Carolina at Chapel Hill , 120 E. Cameron Avenue, Chapel Hill, NC 27599-3255, USA
- Jeffrey Rich
- ORCiD
- The Observatories of the Carnegie Institution for Science , 813 Santa Barbara Street, Pasadena, CA 91101, USA
- Stuart D. Ryder
- ORCiD
- School of Mathematical and Physical Sciences, Macquarie University , 105 Delhi Road, North Ryde NSW 2109, Australia; Macquarie University Research Centre for Astronomy , Astrophysics & Astrophotonics, Sydney NSW 2109, Australia
- Nathan Smith
- ORCiD
- Department of Astronomy/Steward Observatory, University of Arizona , 933 North Cherry Avenue, Rm. N204, Tucson, AZ 85721-0065, USA
- Samuel Wyatt
- ORCiD
- Department of Astronomy/Steward Observatory, University of Arizona , 933 North Cherry Avenue, Rm. N204, Tucson, AZ 85721-0065, USA
- Sheng Yang
- ORCiD
- The Oskar Klein Centre, Department of Astronomy, Stockholm University , AlbaNova SE-10691 Stockholm, Sweden
- DOI
- https://doi.org/10.3847/1538-4357/aca9be
- Journal volume & issue
-
Vol. 946,
no. 1
p. 7
Abstract
SN 2018aoz is a Type Ia SN with a B -band plateau and excess emission in infant-phase light curves ≲1 day after the first light, evidencing an over-density of surface iron-peak elements as shown in our previous study. Here, we advance the constraints on the nature and origin of SN 2018aoz based on its evolution until the nebular phase. Near-peak spectroscopic features show that the SN is intermediate between two subtypes of normal Type Ia: core normal and broad line. The excess emission may be attributable to the radioactive decay of surface iron-peak elements as well as the interaction of ejecta with either the binary companion or a small torus of circumstellar material. Nebular-phase limits on H α and He i favor a white dwarf companion, consistent with the small companion size constrained by the low early SN luminosity, while the absence of [O i ] and He i disfavors a violent merger of the progenitor. Of the two main explosion mechanisms proposed to explain the distribution of surface iron-peak elements in SN 2018aoz, the asymmetric Chandrasekhar-mass explosion is less consistent with the progenitor constraints and the observed blueshifts of nebular-phase [Fe ii ] and [Ni ii ]. The helium-shell double-detonation explosion is compatible with the observed lack of C spectral features, but current 1D models are incompatible with the infant-phase excess emission, ${B}_{\max }\mbox{--}{V}_{\max }$ color, and weak strength of nebular-phase [Ca ii ]. Although the explosion processes of SN 2018aoz still need to be more precisely understood, the same processes could produce a significant fraction of Type Ia SNe that appear to be normal after ∼1 day.
Keywords
- Binary stars
- Supernovae
- Type Ia supernovae
- White dwarf stars
- Transient sources
- Time domain astronomy
