J/ApJ/729/143 Photometry of type IIn SN 2008am (Chatzopoulos+, 2011)
SN 2008am: a super-luminous type IIn supernova.
Chatzopoulos E., Wheeler J.C., Vinko J., Quimby R., Robinson E.L.,
Miller A.A., Foley R.J., Perley D.A., Yuan F., Akerlof C., Bloom J.S.
<Astrophys. J., 729, 143 (2011)>
=2011ApJ...729..143C 2011ApJ...729..143C
ADC_Keywords: Supernovae ; Photometry, UBV ; Photometry, infrared ;
Photometry, ugriz ; Photometry, ultraviolet
Keywords: circumstellar matter - hydrodynamics - stars: evolution -
supernovae: general - supernovae: individual (SN 2008am)
Abstract:
We present observations and interpretation of the Type IIn supernova
SN 2008am discovered by the ROTSE Supernova Verification Project
(RSVP). SN 2008am peaked at approximately -22.3mag at a redshift of
z=0.2338, giving it a peak luminosity of ∼3x1044erg/s and making it
one of the most luminous supernovae ever observed. The host galaxy
appears to be an SB1 of normal luminosity (Mr'~-20) with metallicity
Z∼0.4Z☉. ROTSE upper limits and detections constrain the rise
time to be ∼34 days in the rest frame, significantly shorter than
similar events, SN 2006gy and SN 2006tf. Photometric observations in
the ultraviolet, optical, and infrared bands (J, H, Ks) constrain the
spectral energy distribution evolution. We obtained six optical
spectra of the supernova, five on the early decline from maximum light
and a sixth nearly a year later plus a very late time spectrum (∼2yr)
of the host galaxy. The spectra of SN 2008am show strong Balmer-line
and HeI5876 emission with intermediate widths (∼25Å) in the first
∼40 days after optical maximum.
Description:
SN 2008am was discovered in unfiltered ROTSE-IIIb images on 2008
January 10.4 UT (MJD=54475.4; Yuan et al. 2008CBET.1262....1Y 2008CBET.1262....1Y) when it
had an unfiltered magnitude of 18.7. The position of the SN in the
ROTSE images was determined to be RA=12:28:36.25 and DEC=+15:34:49.1,
slightly offset from the center of its host SDSS J122836.32+153449.6.
OTSE-IIIb continued to gather unfiltered photometric data for ∼200
days after the discovery (Table 1).
SN 2008am was followed up with photometric observations ranging from
the ultraviolet (UV) through the infrared (IR). The Peters Automated
Infrared Imaging Telescope (PAIRITEL) obtained J-, H-, and Ks-band
photometry over a 25 day period (Table 2).
The Palomar 60 inch (P60) telescope obtained optical photometry in the
bands g, r, i', and z' for a period of ∼330 days in the rest frame
(Table 4).
Swift photometry was obtained by the Ultraviolet/Optical Telescope
(UVOT) covering the first ∼80 rest-frame days after maximum (Table 5).
Objects:
-------------------------------------------------
RA (2000) DE Designation(s)
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12 28 36.25 +15 34 49.1 SN 2008am = SN 2008am
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 35 82 ROTSE-IIIb unfiltered photometry of SN 2008am
table2.dat 56 19 PAIRITEL IR photometry of SN 2008am
table4.dat 39 212 P60 photometry of SN 2008am
table5.dat 39 27 Swift UVOT photometry of SN 2008am
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See also:
B/sn : Asiago Supernova Catalogue (Barbon et al., 1999-)
J/A+A/544/A81 : Supernovae and their hosts in the SDSS DR8 (Hakobyan+, 2012)
J/A+A/538/A120 : A unified supernova catalogue (Lennarz+, 2012)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.2 d MJD Modified Julian Date (refer to the
observer frame)
10- 23 A14 "YYYY/MMM/DD" Date Date of observation (UT date; in decimal
days)
25 A1 --- l_mag Limit flag on mag
26- 30 F5.2 mag mag Magnitude (observed value; not corrected
for extinction)
32- 35 F4.2 mag e_mag ? mag uncertainty
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.2 d MJD Modified Julian Date (refer to the
observer frame)
10- 23 A14 "YYYY/MMM/DD" Date Date of observation (UT date; in decimal
days)
25- 29 F5.2 mag Jmag J-band magnitude (1)
31- 34 F4.2 mag e_Jmag Jmag uncertainty
36- 40 F5.2 mag Hmag H-band magnitude (1)
42- 45 F4.2 mag e_Hmag Hmag uncertainty
47- 51 F5.2 mag Ksmag Ks-band magnitude (1)
53- 56 F4.2 mag e_Ksmag Ksmag uncertainty
-------------------------------------------------------------------------------
Note (1): Observed value; not corrected for extinction.
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Byte-by-byte Description of file: table4.dat table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.2 d MJD Modified Julian Date (refer to the
observer frame)
10- 23 A14 "YYYY/MMM/DD" Date Date of observation (UT date in decimal days)
25- 28 A4 --- Filt Filter (g', r' or i' for table 4; UBV,
UVW1, UVM2 or UVW2 for table 5)
30- 34 F5.2 mag mag Magnitude in Filt; corrected for extinction
in table 4 - not corrected in table 5
36- 39 F4.2 mag e_mag mag uncertainty
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 14-Sep-2012