Photometric Light Curve: SN2023ixf (M101)

Object: SN2023ixf, RA/DEC (2000) 14:03:38.557 +54:18:42.03

Type SN II

Imaging (1): D Singh, India, 0.08m UV/IR+CMOS
Imaging (2): G Visweswaran, USA, 0.33m Lum+CMOS

Imaging (3) Chris Kagy, USA
Measure (1): V K Agnihotri, India
Imaging & Measure (2): Dr. A Raj, 610mm V+CCD, ICSP, Kolkata, India.

Contact mail ID: ashish@csp.res.in, ashishpink@gmail.com

We report V-band photometric observations of SN2023ixf using different size telescopes, namely the 80mm UV/IR+CMOS, India, 330mm Lum+CMOS, USA, 80mm Lum+CMOS, USA and 610mm Vasistha telescope at IERCOO, Sitapur, ICSP, Kolkata. The reported magnitudes also include those obtained from pre-discovery images obtained by D. Singh from Amarkantak, India The supernova was discovered by K. Itagaki on 2023-05-19.727 UT. Photometric calibrations are done using Tycho software and ATLAS catalogue.

Photometric Data of SN2023ixf at M101

EpochMagnitudeFilter
JD2460084.09016.530±0.240V
JD2460084.09415.260±0.240V
JD2460084.09715.050±0.240V
JD2460084.10115.190±0.240V
JD2460084.10514.920±0.240V
JD2460084.11915.260±0.240V
JD2460085.19912.825±0.070V
JD2460086.29911.856±0.060V
JD2460086.59711.446±0.005V
JD2460086.68011.380±0.010V
JD2460086.79811.464±0.018V
JD2460087.17311.946±0.090V
JD2460088.35011.095±0.004V
RGB_all__integration_DBE_SCNR

Spectroscopy: W Ori & BL Ori
Carbon stars in Orion “The Hunter”

We examine the optical spectrum of two carbon stars in Orion constellation. 4056Å C3 complex (STRONG in comets), 4217Å CN, 4380Å C2 Swan, 4738Å C2 Swan, 5165Å C2 Swan (STRONG), 5635Å C2 Swan, 6122Å C2 Swan, 4554Å BaII, 4607Å SrI Also look for the SiC2 bands at 4581Å, 4640Å, 4867Å, 4906Å, 4977Å.

Comet Afrho and Water Production Rate

“The [Afrho] parameter and the cometary activity. The [Afrho] parameter is a parameter defined by A’Hearn et al. (1984) to measure the activity of comets. This parameter is proportional to the dust “filling factor”, the ratio of the integrated cross section of the dust particles and the projected surface of the diaphragm in the field of view. The use of this parameter will be discussed. Simple ways of calculating it from calibrated CCD images of comets will be explained and illustrated with examples. The total magnitude depends on the diaphragm used and the wavelength and is a mix of dust and gas emissions. Afrho allows the monitoring of the dust emission rate of comets, dust properties through reddening and the gas to dust ratio.

We estimated the comet Afrho and water production rate for comet C/2022 E3.

CometC/2022 E3
Date2023.02.140156
CCD bin2
CCD pixel micron3.76
CCD resolution arcsec/pixel0.67
Tycho Aperture30
Photometric aperture20.1
comet to earth distance AU0.5
comet to sun distance AU1.229
Sun R Mag-27.09
Comet R band mag8.52
Comet phase angle 50.3
rho(Km)7270
Afrho (cms)5917
mH Heliocentric mag9.02
Water Production rate Q(H2O) Kg/sec867.09
Telescope dia mm 330
Focal mm2320
Observer Gowri Visweswaran
Measures V. K. Agnihotri

Spectrum: VY Uma (Carbon Star)

Carbon stars are typically evolved cool giants with some circumstellar material in the form of shells, soot, disks, or clouds. Carbon compounds are present in the photosphere after a star enters the red-giant evolutionary phase, when heavy elements (such as carbon) are dredged up from the stellar interior. For carbon features to form in the stellar photosphere, the C/O ratio is > 1, where C and O are the number of carbon and oxygen atoms present in the star. The C2 Swan bands are the dominate optical spectral features. Other strong features include C3, CN, CH, SiC2, CaII and there is often a strong NaD line.

Classical carbon stars are classified into the N and R series, where the N series stars are older stars that show s-process element (Ba, Sr) enhancement over the R stars. The CH stars are high-velocity Population II halo carbon stars, with enriched CH. An abundance index of C2 is also needed to describe a measure of excess carbon over oxygen. C2x, where x indicates increasing band strength from 1 to 8.
Another classification scheme (Yamashita 1975) uses designations for temperature and carbon band strength, such as C7,3. The first number indicates decreasing temperature from 0 to 9, as is the standard scheme for other spectral types. The second number indicates increasing strength of the carbon bands, from 1 to 5.

Some presumed giant C stars were seen to have high proper motions, and coupled with low luminosity, were determined to be the elusive dwarf carbon (dC) star. See Paul Green’s excellent papers on the dC’s.

RCrB and HdC stars are hydrogen deficient supergiant carbon stars. They likely formed from giants that have shed ALL of their hydrogen in the AGB stage, or were possibly created from the merger of white dwarfs. RCrB stars are variable due to circumstellar clouds of sooty carbon grains, and from pulsations(?), whereas typical HdC stars are not variable. These stars have unusual optical spectra, but will show weak CH and Balmer hydrogen lines, and strong HeI emission. These stars recently experienced a final He-shell flash.
Examples include RCrB, RYSgr, XXCam, MVSgr, DYPer, and HD182040 (non-variable).

Carbon features also make an appearance in the DQ class of white dwarfs, and carbon features are common in the spectra of comets.

Some of my favorite carbon star features include (in Angstroms): 3880Å CN (STRONG in comets), 4056Å C3 complex (STRONG in comets), 4217Å CN, 4380Å C2 Swan, 4738Å C2 Swan, 5165Å C2 Swan (STRONG), 5635Å C2 Swan, 6122Å C2 Swan, 4554Å BaII, 4607Å SrI
Also look for the SiC2 bands at 4581Å, 4640Å, 4867Å, 4906Å, 4977Å.

Note that the molecular carbon bands have a reverse profile than that of TiO, that is the carbon bands start with a sharp bandhead edge at the red end of the band and then taper off towards the blue. (With an exception of the SiC2 bands, which taper off towards the red!)

Credit: https://lweb.cfa.harvard.edu/~pberlind/atlas/htmls/cstars.html

https://lweb.cfa.harvard.edu/~pberlind/atlas/htmls/carboncat.html

Relative abundance of C2/C3/CN in comet C/2022E3 ZTF

We carried out the spectroscopy of comet C/2022E3 ZTF (V mag = +5.7) as on 28th January-2023, using Aply600 spectrograph (23µm long slit, R=700, Angstrom /Pixel (A/P) =1.9) fixed on 0.36m RC. The spectral image captured using SX814 cooled monochrome CCD coupled with Aply600 spectrograph. The image guided over spectrograph slit using Atik 414 monochrome CCD to get better S/N ratio. Comet seems enriched with C2,CH+,NH2 & CN.

The spectral data corrected for instrument response and baseline corrected. We used RSpec and OriginPro2020 for data analysis.

We tried to estimate the relative abundance of C2/C3/CN in comet C/2022E3 ZTF using Lorentz fitting. The area of respective peaks are calculated for C2/C3/CN, We find the results as follows. Figure attached.

Lorentzian Fit/Relative abundance

CN(3883) = 34997.4
C2(5140/0-0)+C2(5165/0-0)= 48608.6 + 6552.3= 55160.9
C3= 11507.04

C2/CN = 1.58
C3/CN = 0.32

The link of supported document / paper is given below.

Title: The Ratio of Production Rates of C2 and C3 to CN in Six Comets
Authors: Williams, I. P., Andrews, P. J., Fitzsimmons, A., & Williams, G. P.
Journal: Asteroids, comets, meteors III, Proceedings of a meeting (AMC 89) held at the
Astronomical Observatory of the Uppsala University,
June 12-16, 1989, Uppsala: Universitet, 1990, edited by C.I. Lagerkvist, H. Rickman,
and B.A. Lindblad., p.471
Bibliographic Code: 1990acm..proc..471W

Spectrum: C/2022E3 ZTF

We carried out the spectroscopy of comeC/2022E3 ZTF (Vmag = +5.7) as on 28th January-2023, using Aplt600 spectrograph (23µm long slit, R=700, Angstrom /Pixel (A/P) =1.9) fixed on 0.36m RC. The spectral image captured using SX814 cooled monochrome CCD coupled with Aply600 spectrograph. The image guided over spectrograph slit using Atik 414 monochrome CCD to get better S/N ratio. Comet seems enriched with C2,CH+,NH2 & CN.
The spectral data corrected for instrument response and baseline corrected. We used RSpec and OriginPro2020 for data analysis.
Cepheids Observatory India

Comet C/2022E3 ZTF

Image Info:
Object: C/2022E3 ZTF
DATE-OBS: 2023 01 17.94404
EXPTIME(Seconds): 1130
SUBFRMS: 25
OBJCTRA: 15 40 58.59
OBJCTDEC: 45 25 37.3
Binning: 1 X 1
Plate Scale: 0.96″ /Pixel
Orientation: North UP/ East Left
Catalogs & Filter Magnitude Results:
Astrometry Catalog: GAIA DR3
Photometry Catalog: GAIA DR3
Imaging Filter: Luminance
Photometry Mag: +8.4
Instruments:
CCD: KAF-11002M (9.0µm x 9.0µm)
TELESCOPE: 0.36m RC, 1936.0mm
PRiSMv11, Tycho10.0.3
Site:
ORIGIN: Cepheid Observatory, India
SITELAT: +24:55:00:00
SITELONG:+75:33:58:99
Observers:
Cepheid Observatory
VS Observatory
Remark:
Sky Clear

Comet C/2020V2 ZTF

Image Info:
Object: C/2020V2 ZTF
DATE-OBS: 2023 01 15.60526
EXPTIME(Seconds): 1710
SUBFRMS: 38
OBJCTRA: 01 31 21.67
OBJCTDEC: 69 03 29.1
Binning: 1 X 1
Plate Scale: 0.96″ /Pixel
Orientation: North UP/ East Left
Catalogs & Filter Magnitude Results:
Astrometry Catalog: UCAC4
Photometry Catalog: UCAC4
Imaging Filter: Luminance
Photometry Mag: +9.84
Instruments:
CCD: KAF-11002M (9.0µm x 9.0µm)
TELESCOPE: 0.36m RC, 1936.0mm
PRiSMv11, Tycho10.0.3
Site:
ORIGIN: Cepheid Observatory, India
SITELAT: +24:55:00:00
SITELONG:+75:33:58:99
Observers:
Cepheid Observatory
VS Observatory
Remark:
Sky Clear

Photometry: CoRoT-1b

Exo-Planet, Class confirmed:
CoRoT-1b
Imaged/Calibration/Image solve:
PRiSM v11
Photometry and Data Fitting:
HOPS 3.1.0/Platform: Python 3.9
Instrument:
CCD: SX-35 (KAF11002M)
FILTERS: Luminance
TELESCOPE: RC14, 1945.0 mm
Site:
ORIGIN: Cepheid Observatory India
SITELAT: +24:55:00:00
SITELONG:+75:33:58:99
Observers:
Cepheid Observatory India, VS Observatory India
Remark:
Sky Clear