J/MNRAS/469/4341 Seven recent novae BVI light curves (Munari+, 2017)
Photometric evolution of seven recent novae and the double-component
characterizing the light curve of those emitting in gamma rays.
Munari U., Hambsch F.-J., Frigo A.
<Mon. Not. R. Astron. Soc., 469, 4341-4358 (2017)>
=2017MNRAS.469.4341M 2017MNRAS.469.4341M (SIMBAD/NED BibCode)
ADC_Keywords: Novae ; Photometry, UBVRI
Keywords: novae, cataclysmic variables
Abstract:
The BVI light curves of seven recent novae (i.e. V1534 Sco, V1535 Sco,
V2949 Oph, V3661 Oph, MASTER OT J010603.18-744715.8,
TCP J18102829-2729590 and ASASSN-16ma) have been extensively mapped with
daily robotic observations from Atacama (Chile): five belong to the
Galactic bulge, one to the Small Magellanic Cloud and another is a
Galactic disc object. The two programme novae detected in γ-rays
by Fermi-LAT (i.e. TCP J18102829-2729590 and ASASSN-16ma) are bulge
objects with unevolved companions. They distinguish themselves by
showing a double-component optical light curve. The first component to
develop is the fireball from freely expanding, ballistic-launched
ejecta, with a time of passage through maximum that is strongly
dependent on wavelength (∼1d delay between the B and I bands). The
second component, emerging simultaneously with the nova detection in
γ-rays, evolves at a slower pace, its optical brightness being
proportional to the γ-ray flux, and its passage through maximum
not dependent on wavelength. The fact that γ-rays are detected
at a flux level that differs by four times from novae at the distance
of the bulge seems to suggest that γ-ray emission is not a
widespread property of normal novae. We discuss the advantages offered
by high-quality photometric observations collected with only one
telescope (as opposed to data provided by a number of different
instruments). We also observe the effects of the wavelength dependence
of fireball expansion, the recombination in the flashed wind of a
giant companion, the subtle presence of hiccups and plateaus, and the
super-soft X-ray emission and its switch-off. Four programme novae
(V2949 Oph, V3661 Oph, TCP J18102829-2729590 and ASASSN-16ma) have
normal dwarf companions: V1534 Sco contains an M3 III giant, V1535 Sco
a K-type giant and MASTER OT J010603.18-744715.8 a subgiant. We also
comment briefly on the maximum absolute magnitude relation with
decline time (MMRD).
Description:
BVI optical photometry of the programme novae was obtained with the
Asiago Novae and Symbiotic Stars (ANS) Collaboration's robotic
telescope 210, located in San Pedro de Atacama, Chile. All novae were
observed ∼daily for as long as solar conjunction allowed after their
discovery. Telescope 210 is a 40-cm f/6.8 Optimized Dall-Kirkham
(ODK). It mounts an FLI-cooled CCD camera equipped with a 4kx4k Kodak
16803 sensor of 9-um pixel size. The photometric BVI filters are of
the multilayer dielectric type and are manufactured by Astrodon.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 57 7 List of studied novae
table2.dat 129 443 Our BVIc photometry of the programme novae
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Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 29 A29 --- Name Nova name
31- 32 I2 h RAh Right ascension (J2000)
34- 35 I2 min RAm Right ascension (J2000)
37- 41 F5.2 s RAs Right ascension (J2000)
43 A1 --- DE- Declination sign (J2000)
44- 45 I2 deg DEd Declination (J2000)
47- 48 I2 arcmin DEm Declination (J2000)
50- 53 F4.1 arcsec DEs Declination (J2000)
55- 57 I3 --- Nobs Number of measurements in table2.dat
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 29 A29 --- Name Nova name
32- 35 I4 --- Code Internal code (0300, 0603, 0607 or 2100)
37- 49 F13.5 d HJD Heliocentric Julian date
51- 64 A14 "datime" Obs.date Observation date (YYYY/MM/DD.ddd)
66- 71 F6.3 mag Bmag ? Johnson B magnitude
73- 77 F5.3 mag e_Bmag ? rms uncertainty on B magnitude (1)
79- 84 F6.3 mag Vmag ? Johnson V magnitude
86- 90 F5.3 mag e_Vmag ? rms uncertainty on V magnitude (1)
92- 97 F6.3 mag Icmag ? Cousins I magnitude
99-103 F5.3 mag e_Icmag ? rms uncertainty on I magnitude (1)
105-110 F6.3 mag B-V ? Johnson B-V colour index
112-116 F5.3 mag e_B-V ? rms uncertainty on B-V colour index (1)
118-123 F6.3 mag V-Ic ? Johnson-Cousins V-Ic colour index
125-129 F5.3 mag e_V-Ic ? rms uncertainty on V-Ic colour index (1)
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Note (1): The quoted uncertainties are total error budgets, adding quadratically
the Poissonian contribution on the nova to the uncertainty (measured on the
stars of the local photometric sequence) in the transformation from the
instantaneous local photometric system to the standard one.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 18-Apr-2020