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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

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 $${R}_{\odot }$$.
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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)
Publication Date:
Report Number(s):
Journal ID: ISSN 1538-4357
Grant/Contract Number:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 826; Journal Issue: 2; Journal ID: ISSN 1538-4357
Institute of Physics (IOP)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Laboratory Directed Research and Development (LDRD) Program
Country of Publication:
United States
79 ASTRONOMY AND ASTROPHYSICS; astronomy and astrophysics; galaxies: distances and redshifts; supernovae: individual (ASASSN-14lp; Type Ia; NGC 4666; ASASSN-14lp); white dwarfs
OSTI Identifier: