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Title: The young and bright Type Ia supernova ASASSN-14lp: Discovery, early-time observations, first-light time, distance to NGC 4666, and progenitor constraints

Journal Article · · The Astrophysical Journal (Online)
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  1. Carnegie Observations, Pasadena, CA (United States)
  2. The Ohio State Univ., Columbus, OH (United States)
  3. Univ. Diego Portales, Santiago (Chile); Millennium Institute of Astrophysics, Santiago (Chile)
  4. Carnegie Observatories, La Serena (Chile); Aarhus Univ., Aarhus (Denmark)
  5. Itagaki Astronomical Observatory, Yamagata (Japan)
  6. Dartmouth College, Hanover, NH (United States)
  7. The Ohio State Univ., Columbus, OH (United States); Grove City High School, Grove City, OH (United States)
  8. Liverpool John Moores Univ., Liverpool (United Kingdom)
  9. Coral Towers Observatory, Queensland (Australia)
  10. AFOEV (Association Francaise des Observateurs d'Etoiles Variables), Observatoire de Strasbourg, Strasbourg (France)
  11. Peking Univ., Beijing (China)
  12. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
  13. Morehead State Univ., Morehead, KY (United States)
  14. Carnegie Observatories, La Serena (Chile); Aarhus Univ., Aarhus (Denmark); Florida State Univ., Tallahassee, FL (United States)
  15. Variable Stars Observers League in Japan (VSOLJ), Kamagaya (Japan)
  16. Carnegie Observatories, La Serena (Chile)
  17. Groupe SNAUDE (France)
  18. Warsaw Univ. Astronomical Observatory, Warsaw (Poland)
  19. Stockholm Univ., Stockholm (Sweden)
  20. The Ohio State Univ., Columbus, OH (United States); Univ. of Arizona, Tucson, AZ (United States)
  21. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
+ Show Author Affiliations

On 2014 December 9.61, the All-sky Automated Survey for SuperNovae (ASAS-SN or "Assassin") discovered ASASSN-14lp just ~2 days after first light using a global array of 14 cm diameter telescopes. ASASSN-14lp went on to become a bright supernova (V = 11.94 mag), second only to SN 2014J for the year. We present prediscovery photometry (with a detection less than a day after first light) and ultraviolet through near-infrared photometric and spectroscopic data covering the rise and fall of ASASSN-14lp for more than 100 days. We find that ASASSN-14lp had a broad light curve ($${\rm{\Delta }}{m}_{15}(B)=0.80\pm 0.05$$), a B-band maximum at 2457015.82 ± 0.03, a rise time of $${16.94}_{-0.10}^{+0.11}$$ days, and moderate host-galaxy extinction ($$E{(B-V)}_{\mathrm{host}}=0.33\pm 0.06$$). Using ASASSN-14lp, we derive a distance modulus for NGC 4666 of $$\mu =30.8\pm 0.2$$, corresponding to a distance of 14.7 ± 1.5 Mpc. However, adding ASASSN-14lp to the calibrating sample of Type Ia supernovae still requires an independent distance to the host galaxy. Lastly, using our early-time photometric and spectroscopic observations, we rule out red giant secondaries and, assuming a favorable viewing angle and explosion time, any nondegenerate companion larger than 0.34 $${R}_{\odot }$$.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1329882
Report Number(s):
LA-UR-15-25033
Journal Information:
The Astrophysical Journal (Online), Vol. 826, Issue 2; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 46 works
Citation information provided by
Web of Science

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Early Blue Excess from the Type Ia Supernova 2017cbv and Implications for Its Progenitor text January 2017
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CO Multi-line Imaging of Nearby Galaxies (COMING) IV. Overview of the Project text January 2019
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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
astronomy and astrophysics
galaxies: distances and redshifts
supernovae: individual (ASASSN-14lp
Type Ia
NGC 4666
ASASSN-14lp)
white dwarfs