J/ApJ/742/L18 Follow-up photometry of the SN IIb PTF 11eon (Arcavi+, 2011)
SN 2011dh: discovery of a type IIb supernova from a compact progenitor in
the nearby galaxy M51.
Arcavi I., Gal-Yam A., Yaron O., Sternberg A., Rabinak I., Waxman E.,
Kasliwal M.M., Quimby R.M., Ofek E.O., Horesh A., Kulkarni S.R.,
Filippenko A.V., Silverman J.M., Cenko S.B., Li W., Bloom J.S.,
Sullivan M., Nugent P.E., Poznanski D., Gorbikov E., Fulton B.J.,
Howell D.A., Bersier D., Riou A., Lamotte-Bailey S., Griga T., Cohen J.G.,
Hachinger S., Polishook D., Xu D., Ben-Ami S., Manulis I., Walker E.S.,
Maguire K., Pan Y.-C., Matheson T., Mazzali P.A., Pian E., Fox D.B.,
Gehrels N., Law N., James P., Marchant J.M., Smith R.J., Mottram C.J.,
Barnsley R.M., Kandrashoff M.T., Clubb K.I.
<Astrophys. J., 742, L18 (2011)>
=2011ApJ...742L..18A 2011ApJ...742L..18A
ADC_Keywords: Supernovae ; Photometry, VRI ; Photometry, ultraviolet ;
Photometry, infrared
Keywords: supernovae: individual (PTF11eon/SN2011dh)
Abstract:
On 2011 May 31 UT a supernova (SN) exploded in the nearby galaxy M51
(the Whirlpool Galaxy). We discovered this event using small
telescopes equipped with CCD cameras and also detected it with the
Palomar Transient Factory survey, rapidly confirming it to be a
Type II SN. Here, we present multi-color ultraviolet through infrared
photometry which is used to calculate the bolometric luminosity and a
series of spectra. Our early-time observations indicate that SN 2011dh
resulted from the explosion of a relatively compact progenitor star.
Rapid shock-breakout cooling leads to relatively low temperatures in
early-time spectra, compared to explosions of red supergiant stars, as
well as a rapid early light curve decline. Optical spectra of SN
2011dh are dominated by H lines out to day 10 after explosion, after
which HeI lines develop. This SN is likely a member of the cIIb
(compact IIb) class, with progenitor radius larger than that of
SN 2008ax and smaller than the eIIb (extended IIb) SN 1993J
progenitor. Our data imply that the object identified in pre-explosion
Hubble Space Telescope images at the SN location is possibly a
companion to the progenitor or a blended source, and not the
progenitor star itself, as its radius (∼1013cm) would be highly
inconsistent with constraints from our post-explosion spectra.
Description:
Immediately after discovery by A. Riou, we initiated an extensive
follow-up campaign. Optical and infrared (IR) photometry was obtained
at P48 (R and g' bands), the Wise Observatory 1m and 18in (C18)
telescopes (VRI bands), the Byrne Observatory at Sedgwick Reserve
(BOS, B and i' bands) 0.8m telescope, and the Peters Automated
InfraRed TELescope (PAIRITEL; JHK bands).
The Ultraviolet/Optical Telescope (UVOT) on board Swift followed
SN 2011dh, and preliminary results from these observations were
reported by Kasliwal & Ofek (2011ATel.3402....1K 2011ATel.3402....1K) and Arcavi et al.
(2011ATel.3413....1A 2011ATel.3413....1A).
Objects:
----------------------------------------------------------
RA (2000) DE Designation(s)
----------------------------------------------------------
13 30 36.00 +47 06 33.0 SN 2011dh = PTF 11eon
----------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 65 514 Photometric observations of SN 2011dh
--------------------------------------------------------------------------------
See also:
B/sn : Asiago Supernova Catalogue (Barbon et al., 1999-)
J/other/PZ/32.6 : UBVRI light curves of SN 2011dh (Tsvetkov+, 2012)
J/MNRAS/412/1441 : SNe luminosity functions (Li+, 2011)
J/ApJ/736/159 : Photometry monitoring of the SN PTF10vdl (Gal-Yam+, 2011)
J/other/PZ/29.2 : SN 2008ax UBVRI light curves (Tsvetkov+, 2009)
J/MNRAS/389/955 : u'BVg'r'i'z' light curves of SN 2008ax (Pastorello+, 2008)
J/AJ/107/1022 : UBVRI photometry of SN 1993J (Richmond+, 1994)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.3 d JD Julian Date of observation
13- 25 A13 --- Tel Telescope used in observation
27- 31 A5 --- Inst Instrument used in observation
33- 48 A16 --- Filt Filter used in observation (1)
50 A1 --- l_mag Limit flag on mag
52- 57 F6.3 mag mag Observed magnitude in Filt (1)
59- 63 F5.3 mag e_mag ? Error in mag
65 A1 --- f_mag [n] Indicates a 3σ nondetection
--------------------------------------------------------------------------------
Note (1): Our photometry is corrected for Galactic extinction using the
Schlegel et al. (1998ApJ...500..525S 1998ApJ...500..525S) maps via NED and applying the
Cardelli et al. (1989ApJ...345..245C 1989ApJ...345..245C) algorithm assuming RV=3.1.
We do not correct for host-galaxy extinction, as it is found to be
small. We adopt a distance modulus of 29.52mag and present our
photometry in the Vega system (except for the P48, i'-band BOS, and
UVOT data which are calibrated to the AB system). The filters are:
UVW1 (0.26um), UVM2 (0.225um), UVW2 (0.196um), U B V R I J H K g' i'
or unfiltered.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 26-Apr-2013