Manuel Pichardo Marcano (Texas Tech University)
Liliana Rivera Sandoval, Thomas J. Maccarone, Simone Scaringi
TACOS:
TESS AM CVn Outbursts Survey
Transiting Exoplanet Survey Satellite TESS
TESS Cadence and Coverage
- Primary mission:
- 2-min selected targets
- 30-min full-frame images (FFI).
- Extended:
- 20 sec selected targets
- 10-min FFI
- Second extended mission
- 200-second FFI
Disk AM CVns
Luminosity
Period (min)
High state (high Ṁ)
- Hot ionized disk
Outbursting System
~20
~10
~40-60 (?)
Low state (low Ṁ)
- Cold stable disk
Caltech
Caltech
-
Porb 20 to ~ 60 minutes (?)
-
Superoutburts (SO) and "Normal" outbursts (NO)
-
Disk instability model (DIM)
-
Constant Mass transfer rate
-
Tidal-thermal disk instability model
-
SO: Superhumps (periodic brightness variation )
-
-
Outbursting Systems
Tidal radius
3:1 Resonance radius
Accretion disk
Precessing eccentric disc
Kley et al. 2008
Kimura 2020
Caltech
-
Porb 20 to ~ 60 minutes (?)
-
Superoutburts (SO) and "Normal" outbursts (NO)
-
Disk instability model (DIM)
-
Constant Mass transfer rate
-
Tidal-thermal disk instability model
-
SO: Superhumps (periodic brightness variation )
-
-
Outbursting Systems
Better LC → Better Constraints
Place Constraints
Tidal radius
3:1 Resonance radius
Accretion disk
- Trec ∝ Porb7.35
- Tdur ∝ Porb4.45
- Δ mag ∝ Porb
- Ground-Based:
- PTF/CRTS
- LINEAR
- ZTF
Levitan et al. 2015
See also Duffy et al. 2021
Better LC → Better Constraints
Constraint Empirical Relationships
Outbursts
Pichardo Marcano et al. (2021)
SO duration
ASASSN-14cc
Pichardo Marcano et al. (2021)
9–18 d
kato et al. (2015)
- 2 Super Outbursts:
- Porb 22.5 min
- Variable in length
- Compare Kato+'15 and Duffy+'21
- Superhump period
- 10 minute cadence
~7 d
-
Precursor
- TESS (Duffy et al. 2021)
-
5/6 have Precursor
- Except ASASSN-14cc
PTF1 J0719+4858
Pichardo Marcano et al. (2021)
ZTF
TESS
Precursor
Type of Super Outbursts
Osaki et al. (2005)
High Mass Ratio
DIM
Cataclysmic Variables
See also Duffy et al. (2021)
High Mass Ratio
High Mass Ratio
High Mass Ratio
eccentric disc develops rapidly
Type of Echo Outbursts
SDSS J1043+5632
PTF1 J0719+4858
- Porb = 28.5 min
- WZ Sge like
- Precursors
- EMT (Hameury+'20)
- Reflection:
- Hot Massive WD
- Porb = 26.7 min
- Compare to TCP J21040470+4631129
- EMT (Hameury+'20)
- Helium "SU UMa"
- EMT+TTI (Kotko+'12)
SO
rebrightening
SO
rebrightening
- Color Evolution
PTF1 J0719+4858
Pichardo Marcano et al. (2021)
ZTF
SO
NO
SO
NO
rebrightening
rebrightening
Color Evolution
PTF1 J0719+4858
SS Cyg
Cataclysmic Variable
Hameury et al. (2020)
-
Similar to Dwarf Novae
-
Hameury et al. (2020)
-
-
Similar SDSS J1411+4812
- Rivera Sandoval et al. (2021)
-
Compare to SDSS 1137
- Rivera Sandoval et al. (2021)
Pichardo Marcano et al. (2021)
rebrightening
Color Evolution
PTF1 J0719+4858
-
Similar to Dwarf Novae
-
Hameury et al. (2020)
-
-
Similar SDSS J1411+4812
- Rivera Sandoval et al. (2021)
-
Compare to SDSS 1137
- Rivera Sandoval et al. (2021)
Pichardo Marcano et al. (2021)
rebrightening
SDSS J113732+405458
Enhanced mass transfer
Rivera Sandoval et al. (2021)
Porb = 26.7 min
Porb ~ 60 min
- Color Evolution
SDSS J1043+5632
Pichardo Marcano et al. (2021)
ZTF
TESS
SDSSJ1043+5632
-
Similar to Dwarf Novae:
- Hameury et al. (2020)
- Rivera Sandoval et al. (2021)
Color Evolution
rebrightening
Long-term monitoring
- Observed 357 days
- Recurrence Time:
- 203 days
- Porb = 30.14 min :
- 2-minute cadence
- "Normal Outburts"
Gaia16all
Sector 5
Sector 12
Normal Outbursts
PTF1 J2219+3135
V803 Cen
- V803 Cen
- Porb = 26.9 min
- "Cycle"
- Low Ṁ
- PTF1 J2219+3135:
- New Porb= 27.7 min
- Agrees with Trec
- Permanent Superhumper?
Superoutburst duration vs Porb
Pichardo Marcano et al. (2021)
TACOS Summary
-
Precursors and "Normal" Outbursts:
- Relatively Common
- Short Duration (missed by ground-based)
-
Echo Outbursts:
- Different morphology
- Enhanced Mass Transfer
- Superoutburst durations overestimated
-
Two new candidate orbital periods
- Constraint on Trec vs. Porb
- Color Evolution
Extra
Mass-transfer rates vs orbital period
Mass-transfer rates vs orbital period
Other work with Accreting WDs
-
Follow-up eROSITA transient:
- TESS time series analysis
-
-
Atel: Pichardo Marcano (2020)
-
Paper: Schwope, [...], Pichardo Marcano, et al. (2021)
-
Caltech
PTF1 J0719+4858:
-
Similar to Dwarf Novae:
- Hameury et al. (2020)
- Rivera Sandoval et al. (2021)
Color Evolution
Pichardo Marcano et al. (2021)
Normal Outbursts
V803 Cen
- WZ Sge like ?
- Precursors
- EMT (Hameury+'20)
- Massive WD?
- Compare to TCP J21040470+4631129
- EMT (Hameury+'20)
- Helium "SU UMa"
- EMT+TTI (Kotko+'12)
Long-term monitoring
Pichardo Marcano et al. (2021)
- Orbital Periods:
- 2-minute cadence
- Limits on Recurrence Time
- "Normal Outburts"
Gaia16all