J/ApJ/945/107 Follow-up phot. & sp. of type IIP SN2018lab (Pearson+, 2023)
Circumstellar medium interaction in SN 2018lab, a low-luminosity type IIP
supernova observed with TESS.
Pearson J., Hosseinzadeh G., Sand D.J., Andrews J.E., Jencson J.E.,
Dong Y., Bostroem K.A., Valenti S., Janzen D., Retamal N.M.,
Lundquist M.J., Wyatt S., Amaro R.C., Burke J., Howell D.A., McCully C.,
Hiramatsu D., Jha S.W., Smith N., Haislip J., Kouprianov V.,
Reichart D.E., Yang Yi, Rho J.
<Astrophys. J., 945, 107 (2023)>
=2023ApJ...945..107P 2023ApJ...945..107P
ADC_Keywords: Supernovae; Photometry, ugriz; Spectra, optical
Keywords: Supernovae ; Core-collapse supernovae ; Type II supernovae ;
Circumstellar matter
Abstract:
We present photometric and spectroscopic data of SN 2018lab, a
low-luminosity Type IIP supernova (LLSN) with a V-band peak luminosity
of -15.1±0.1mag. SN 2018lab was discovered by the Distance Less Than
40Mpc (DLT40) SN survey only 0.73d post-explosion, as determined by
observations from the Transiting Exoplanet Survey Satellite (TESS).
TESS observations of SN 2018lab yield a densely sampled, fast-rising,
early-time light curve likely powered by ejecta-circumstellar medium
(CSM) interaction. The blueshifted, broadened flash feature in the
earliest spectra (<2d) of SN 2018lab provides further evidence for
ejecta-CSM interaction. The early emission features in the spectra of
SN 2018lab are well described by models of a red supergiant progenitor
with an extended envelope and a close-in CSM. As one of the few LLSNe
with observed flash features, SN 2018lab highlights the need for more
early spectra to explain the diversity of the flash feature morphology
of Type II SNe.
Description:
SN 2018lab was observed by TESS during the mission's Sector 6
operations, from 2018 December 15 18:36:03.542 to 2019 January 6
12:36:19.181 UTC. The TESS light curve of SN 2018lab was previously
published in Vallely+ 2021MNRAS.500.5639V 2021MNRAS.500.5639V
Following the discovery of SN 2018lab by the DLT40 survey, continued
monitoring was done by two of DLT40's discovery telescopes, the
PROMPT5 0.4m telescope at the Cerro Tololo Inter-American Observatory
and the PROMPT-MO 0.4m telescope at the Meckering Observatory in
Australia. Observations taken by these telescopes are calibrated to
the Sloan Digital Sky Survey (SDSS) r band.
Additional UBVgri photometry of SN 2018lab was obtained using the
Sinistro cameras on Las Cumbres Observatory's robotic 1m telescopes,
located at the Siding Spring Observatory, the South African
Astronomical Observatory, and the Cerro Tololo Inter-American
Observatory.
Infrared photometry of SN 2018lab was also obtained with images from
the Infrared Array Camera (IRAC) on board the Spitzer Space Telescope.
The host system was imaged several times between 2014 and 2019 in the
IRAC1 (3.6um) and IRAC2 (4.5um) imaging bands by the SPitzer InfraRed
Intensive Transients Survey (SPIRITS; PI M. Kasliwal; PIDs 10136,
11063, 13053, and 14089).
In Section 3.1.2., we present 12 optical spectra of SN 2018lab ranging
from less than 48hr to over 300d after explosion. Of the 12 spectra
presented in this work, 11 were obtained as a result of a high-cadence
spectroscopic follow-up campaign using the Robert Stobie Spectrograph
(RSS) on the Southern African Large Telescope (SALT) using a 1.50"
slit width, the FLOYDS instruments on the Las Cumbres Observatory's 2m
Faulkes Telescopes North and South (FTN/FTS) with a 2" slit width, the
Low Resolution Imaging Spectrometer (LRIS) on Keck I using a 1.5" slit
width, and one of the Multi-Object Double Spectrographs (MODS1) on the
LBT in the 1.0" segmented longslit configuration. The LBT spectrum
from 308 days post-explosion is discussed in Section 5.4.
We also include in our analysis the classification spectrum from 1.9d
post-explosion (Razza+ 2018TNSCR2015....1R 2018TNSCR2015....1R) taken as part of the
Public European Southern Observatory (ESO) Spectroscopic Survey for
Transient Objects (ePESSTO; Smartt+ 2015, J/A+A/579/A40) using the ESO
Faint Object Spectrograph and Camera (EF0SC2) on the ESO New
Technology Telescope (ESO-NTT) using a 1" slit width with the Grism#13.
Objects:
----------------------------------------------------------
RA (ICRS) DE Designation(s)
----------------------------------------------------------
06 16 26.51 -21 22 32.3 SN 2018lab = DLT 18ar
----------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 58 12 Log of spectroscopic observations
fig3.dat 46 295 SN 2018lab light curves
fig9.dat 25 45797 Spectroscopic evolution of SN 2018lab
--------------------------------------------------------------------------------
See also:
VIII/77 : HI spectral properties of galaxies (Springob+, 2005)
J/ApJ/642/158 : IRAC flux densities in IC2163 and NGC2207 (Elmegreen+, 2006)
J/A+A/465/71 : 21cm observations of 452 galaxies (Theureau+, 2007)
J/MNRAS/394/21 : Multi-epoch spectroscopy of SN 1994W (Dessart+, 2009)
J/MNRAS/394/2266 : SN 2005cs one-year photometry (Pastorello+, 2009)
J/MNRAS/395/1409 : Type II-P SN progenitor constraints (Smartt+, 2009)
J/ApJ/736/159 : Photometry monitoring of the SN PTF10vdl (Gal-Yam+, 2011)
J/MNRAS/442/844 : BVRI light curves of type II-P supernovae (Faran+, 2014)
J/MNRAS/438/L101 : First month on SN 2013ej (Valenti+, 2014)
J/ApJ/799/208 : Type IIP supernovae from Pan-STARRS1 (Sanders+, 2015)
J/A+A/579/A40 : PESSTO catalog (Smartt+, 2015)
J/MNRAS/449/1876 : Photometric observations of SN PTF11iqb (Smith+, 2015)
J/MNRAS/450/3137 : Optical/NIR light curves of SN 2009ib (Takats+, 2015)
J/AJ/151/33 : UBVRIz LCs of 51 Type II supernovae (Galbany+, 2016)
J/ApJ/820/33 : R-band light curves of type II supernovae (Rubin+, 2016)
J/MNRAS/459/3939 : Type II supernova light curves (Valenti+, 2016)
J/MNRAS/461/2003 : SN 2013ej LCs 1 to 450d after explosion (Yuan+, 2016)
J/ApJ/839/88 : Unusual IR transients with Spitzer (SPRITEs) (Kasliwal+, 2017)
J/ApJ/861/63 : Type IIP SN 2016bkv LCs and spectra (Hosseinzadeh+, 2018)
J/ApJ/853/62 : Optical and NIR spectra and LCs of SN2016ija (Tartaglia+, 2018)
J/ApJ/885/43 : UBVRI & ugriz phot. of supernova SN 2017gmr (Andrews+, 2019)
J/ApJ/886/40 : Luminous SPIRITS IR transients follow-up obs. (Jencson+, 2019)
J/ApJ/895/31 : Photometric observations of Type II SN 2018ivc (Bostroem+, 2020)
J/ApJ/902/6 : UV to visible-light obs. of SN 2018fif (Soumagnac+, 2020)
J/ApJ/912/46 : ZTF Type II supernovae with follow-up obs. (Bruch+, 2021)
J/ApJ/938/19 : Optical phot. and sp. monitoring of SN 2019esa (Andrews+, 2022)
J/ApJ/924/15 : Final moments. I. Type II SN 2020tlf (Jacobson-Galan+, 2022)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 "Y/M/D" Date Date of observation (UT)
12- 23 F12.4 d JD Julian Date
25- 29 F5.1 d Epoch [1.6/308] Epoch of observation
31- 37 A7 --- Tel Telescope
39- 51 A13 --- Inst Instrument
53- 58 F6.1 s Exp [600/3600] Exposure time
--------------------------------------------------------------------------------
Byte-by-byte Description of file: fig3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.5 d MJD Modified Julian Date
13- 17 A5 --- Filt Filter used (1)
19- 23 A5 --- l_mag [False/True ] Detection flag (2)
25- 30 F6.3 mag mag [16/20.7] Apparent magnitude in Filter
32- 36 F5.3 mag e_mag [0/0.32]? Uncertainty in mag
38- 46 F9.3 d Phase [-5057/216] Rest frame days since explosion
--------------------------------------------------------------------------------
Note (1): Johnson UBV Vega magnitudes and gri AB magnitudes
from Las Cumbres Observatory.
DLT40 = Distance Less Than 40 Mpc SNe survey
IRAC[1/2] = Spitzer/IRAC 3.4 ("IRAC1") and 4.5 ("IRAC2") micron band.
Note (2): Indicates if the observation is detection (TRUE) or
an upper limit (FALSE).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: fig9.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- ID [1/12] Spectrum identifier code (1)
4- 14 F11.5 0.1nm lambda [3145.6/10196.2] Wavelength; Angstroms
16- 25 E10.3 cW/m2/nm Flux [-1.3e-15/3.3e-15] Flux density;
erg/s/cm2/Angstroms
--------------------------------------------------------------------------------
Note (1): See Table 1 for full observational details.
1 = SALT/RSS observation on epoch day 1.6.
2 = ESO-NTT/EFOCS2 observation on epoch day 1.9.
3 = FTS 2m/FLOYDS observation on epoch day 4.1.
4 = FTS 2m/FLOYDS observation on epoch day 7.0.
5 = FTS 2m/FLOYDS observation on epoch day 11.0.
6 = Keck I/LRIS+LRISBLUE observation on epoch day 13.9.
7 = FTS 2m/FLOYDS observation on epoch day 20.1.
8 = FTS 2m/FLOYDS observation on epoch day 63.9.
9 = FTS 2m/FLOYDS observation on epoch day 74.8.
10 = FTS 2m/FLOYDS observation on epoch day 89.8.
11 = FTS 2m/FLOYDS observation on epoch day 102.0
12 = LBT-SX/MODSIR observation on epoch day 308.0.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 03-Feb-2025