J/ApJ/749/18 Swift/UVOT observations of 12 nearby SN-Ia (Brown+, 2012)
Constraints on type Ia supernova progenitor companions from early ultraviolet
observations with Swift.
Brown P.J., Dawson K.S., Harris D.W., Olmstead M., Milne P., Roming P.W.A.
<Astrophys. J., 749, 18 (2012)>
=2012ApJ...749...18B 2012ApJ...749...18B
ADC_Keywords: Photometry, UBV ; Photometry, ultraviolet ; Supernovae
Keywords: binaries: general - supernovae: general - ultraviolet: general
Abstract:
We compare early ultraviolet (UV) observations of Type Ia supernovae
(SNe Ia) with theoretical predictions for the brightness of the shock
associated with the collision between SN ejecta and a companion star.
Our simple method is independent of the intrinsic flux from the SN and
treats the flux observed with the Swift/Ultra-Violet Optical Telescope
as conservative upper limits on the shock brightness. Comparing this
limit with the predicted flux for various shock models, we constrain
the geometry of the SN progenitor-companion system. We find the model
of a 1 M☉ red supergiant companion in Roche-lobe overflow to be
excluded at a 95% confidence level for most individual SNe for all but
the most unfavorable viewing angles. For the sample of 12 SNe taken
together, the upper limits on the viewing angle are inconsistent with
the expected distribution of viewing angles for red gaint stars as the
majority of companions with high confidence. The separation distance
constraints do allow main-sequence companions. A better understanding
of the UV flux arising from the SN itself as well as continued UV
observations of young SNe Ia will further constrain the possible
progenitors of SNe Ia.
Description:
We use UV and optical observations of 12 nearby (z<0.03),
spectroscopically classified SNe Ia obtained with the Swift/UVOT.
These SNe were selected from the full sample of template-subtracted
SNe Ia (as of 2011 April) based on having UVOT observations within 10
days of the estimated time of explosion. The photometry for seven of
these SNe has been previously published. We also present UVOT
photometry for five newer SNe in Table 1, reduced using the method
outlined in Brown et al. (2009, Cat. J/AJ/137/4517), including
subtraction of the host galaxy flux. To aid in the determination of
the time of explosion, we have added ground-based B-band observations
from Pastorello et al. (2007, Cat. J/MNRAS/376/1301) and Stritzinger
et al. (2010AJ....140.2036S 2010AJ....140.2036S) to the UVOT observations of SNe 2005cf
and 2006dd, respectively.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 43 478 New SN photometry
table2.dat 82 12 SN parameters
table3.dat 70 12 Explosion date and companion separation limits
--------------------------------------------------------------------------------
See also:
J/AJ/143/126 : Spectroscopy of 462 nearby Type Ia supernovae (Blondin+, 2012)
J/ApJ/746/85 : THe HST Cluster Supernova Survey. V. (Suzuki+, 2012)
J/MNRAS/426/2668 : Type Ia SN progenitors X-ray emission (Nielsen+, 2012)
J/AJ/142/156 : The CSP (DR2): photometry of SNe Ia (Stritzinger+, 2011)
J/A+A/529/L4 : Reddening law of type Ia supernovae (Chotard+, 2011)
J/ApJS/192/1 : Light-curve parameters from the SNLS (Conley+, 2011)
J/ApJ/738/162 : SN Ia candidates from the SDSS-II SN Survey (Sako+, 2011)
J/ApJ/731/120 : Intrinsic SN Ia light curves (Mandel+, 2011)
J/ApJ/730/119 : HST/WFC3 obs. of Cepheids in SN Ia hosts (Riess+, 2011)
J/ApJ/722/566 : Host galaxies of SNe Ia in SDSS-II SN survey (Lampeitl+, 2010)
J/ApJ/721/1608 : Absolute UV magnitudes of type Ia SNe (Brown+, 2010)
J/MNRAS/408/827 : Simulations of supernova explosions (Dessart+, 2010)
J/MNRAS/406/782 : Type Ia supernovae luminosities (Sullivan+, 2010)
J/AJ/137/4517 : UVOT light curves of supernovae (Brown+, 2009)
J/ApJS/185/32 : First-year SDSS-II SN results (Kessler+, 2009)
J/MNRAS/389/1577 : UBVRI absolute magnitudes of Type Ia SNe (Takanashi+, 2008)
J/MNRAS/376/1301 : UBVRI light-curves of SN 2005cf (Pastorello+, 2007)
J/ApJ/659/122 : Improved distances to type Ia supernovae (Jha+, 2007)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 15 A15 --- Name SN name
17- 20 A4 --- Filt Swift/UVOT filter (u, b, v, uvm2, uvw1 or uvw2)
22- 28 F7.2 d JD [4606.48/5271.67] Julian Date of observation;
JD-2450000
30 A1 --- l_mag Limit on mag
32- 38 F7.4 mag mag [13.24/21.26] Observed magnitude in Filt
40- 43 F4.2 mag e_mag [0.04/0.36]? Uncertainty in mag
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 15 A15 --- Name SN Name
17- 21 F5.2 mag m-M [31.6/35.1] Distance modulus
23- 26 F4.2 mag e_m-M [0.08/0.26] m-M uncertainty
28 A1 --- r_m-M [b-d] Origin of distance modulus (1)
30- 34 F5.2 mag E(B-V) [-0.1/0.23] Reddening E(B-V)
36- 39 F4.2 mag e_E(B-V) [0.03/0.15] E(B-V) uncertainty
41- 44 F4.2 mag Dm15 [0.85/2] Δm15(B) magnitude decline
46- 49 F4.2 mag e_Dm15 [0.01/0.2] Dm15 uncertainty
51- 56 F6.2 mag BMag [-19.84/-17.21] B-band absolute magnitude
58- 61 F4.2 mag e_BMag [0.17/0.66] BMag uncertainty
63- 75 A13 --- Host Host galaxy name
77- 82 A6 --- TType Host morphological type
--------------------------------------------------------------------------------
Note (1): Hubble flow distances are used except for those noted as follows:
b = Surface brightness fluctuations (SBF) distance from Blakeslee et al.
(2009ApJ...694..556B 2009ApJ...694..556B).
c = SBF distance from Mieske et al. (2005A&A...438..103M 2005A&A...438..103M).
d = SBF distance from Jensen et al. (2003ApJ...583..712J 2003ApJ...583..712J).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 15 A15 --- Name SN Name
17- 23 F7.2 d Date [3517.31/5232.62] Explostion date (JD-2450000)
25- 28 F4.2 d E_Date [0.02/0.58] Positive error on Date
30- 33 F4.2 d e_Date [0.05/1.88] Negative error on Date
35- 38 F4.2 d Ep1 [2.03/8.24] Epoch of first UV data
40 A1 --- l_t50a Limit flag on t50a
42- 46 F5.1 deg t50a [0/180] 50% confidence viewing angle θ
with a13=0.2 (2)
48 A1 --- l_t95a Limit flag on t95a
50- 54 F5.1 deg t95a [0/180] 95% confidence viewing angle θ
with a13=0.2 (2)
56 A1 --- l_t50b Limit flag on t50b
58- 62 F5.1 deg t50b [0/180] 50% confidence viewing angle θ
with a13=2 (2)
64 A1 --- l_t95b Limit flag on t95b
66- 70 F5.1 deg t95b [0/180] 95% confidence viewing angle θ
with a13=2 (2)
--------------------------------------------------------------------------------
Note (2): Viewing angle θ between the companion and the line of sight.
We list 50 and 95% lower limits of θ for two cases of the distance
a13 between the SN progenitor and its companion [a13 in 10+13cm]:
* a13=2 (1.34AU, corresponding to the 1M☉ red giant case)
* a13=0.2 (0.13AU, corresponding to a 6M☉ main sequence companion)
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 07-Nov-2013