Compact Evolved Binaries with exoplanets
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1 Low-mass companion M-dwarf/brown dwarf/white dwarf White dwarf Accretion disk Compact Evolved Binaries with exoplanets Puji Irawati Hot spot Credit: Stuart Littlefair 1
2 Overview of the project Main goal: study of white dwarf binaries through spectroscopic and fast photometric observation Observation proposals: Ellipsoidal binaries (PI: K. Wangnok; w/ N. Sanguansak, K. Chanthorn) Eclipsing white dwarfs (w/ P. Nuchvanichakul, S. Wannawichian) SNIa progenitors (w/ J.Ren, A. Rebassa-Mansergas) Quasi Periodic Pulsation in CV (w/ David Buckley) Stellar occultation (w/ B. Sicardy, F. Braga-Ribas) Budget: PhD scholarship + student support: 67% Observation trip + visiting collaborators: 28% Publication: 5% Visiting astronomers: Dr. Juanjuan Ren / NAOC : March 2018 Dr. David Buckley / SAAO (cancelled due to health issue) 2
3 Collaborators: N. Sanguansak -Thailand D. Buckley SAAO-ZA A. Rebassa-Mansergas UPC-Spain J. Ren ( 任娟娟 ) NAOC- China F. Braga-Ribas B. Sicardy Observatório Nacional Obs. Paris - France Brazil Students: K. Wangnok 3 PhD K. Chanthorn P. Nuchvanichkul CMU BSc S. Wannawichian CMU-Thailand J.G. Doyle Armagh Observatory Northern Ireland Searching for QPP on M-dwarfs flares (comparison with Solar s QPP)
4 List of Publications: 1 Astronomical Journal 2017AJ P 2? Conferences: Status: submitted to MNRAS (July 2018) Next fiscal year report 1 Ellipsoidal binaries observation using the 2.4m Thai National Telescope (STSP 2018, July) K. Wangnok, N. Sanguansak, P. Irawati, K. Chanthorn Oral presentation 2 High time resolution variability, optical photometry, and polarimetry studies of magnetic CVs (COSPAR 2018, July) D. Buckley, J. -M., Bonnet-Bidaud, H. Breytenbach, V. Dhillon, P. Irawati, T. Marsh, M. Motsoaledi, M. Mouchet, S. Potter, P. Woudt Invited 3 The observation CV system V2301 OPH by using ULTRASPEC (SPC 2018, May) P. Nuchvanichakul, P. Irawati, S. Wannawichian Poster presentation 4 High Time Resolution Astrophysics using the Thai 2.4m Telescope with ULTRASPEC (IAUS 339, 2017 Nov) 4 P. Irawati Oral presentation
5 Science highlights V2301 Oph observations Observation using the 2.4m TNT Investigating the O-C variation in this binary Nuchvanichakul et al. (2018) SSS J Siam Physics Congress 2018, May, Phitsanulok The observation CV system V2301 OPH by using ULTRASPEC P. Nuchvanichkul CMU S. Wannawichian CMU-Thailand 5 Nuchvanichakul et al. (2018)
6 Science highlights Ellipsoidal binaries Follow-up observation using the 2.4m TNT Investigating the source of the ellipsoidal modulation Wangnok et al. (2018) K. Chanthorn 5 th Sino-Thai Symposium on High Energy Physics 2018, July, Lijiang Ellipsoidal binaries observation using the 2.4m Thai National Telescope N. Sanguansak K. Wangnok? SSS J Preliminary fit SSS J Wangnok et al. (2018) 6
7 Science highlights Searching for progenitor of Supernovae Type Ia J. Ren ( 任娟娟 ) NAOC-Beijing A. Rebassa-Mansergas UPC-Barcelona Photometric follow-up with 2.4m TNT Updates in 2018: Follow-up LAMOST DR5 Radial velocity based on CaIII lines (previously using NaII) Needs higher SNR (brighter target and longer exposure time) Spectroscopic follow-up with 2.4m TNT CaIII lines (J ) 7
8 New collaboration Fast photometry of flaring stars Goal: searching for quasi periodic pulsation in Solar flare stellar flares QPP is observed in solar flares, link between solar and stellar flares?? Needs high-speed photometry (subsecond) J.G. Doyle Armagh Observatory Northern Ireland YZ Cmi superflare on 21 Jan m TNT, u band, 0.5s Stellar flare on M-dwarf stars 8
9 Future work Data mining Search for new ellipsoidal/peculiar WDMS in GOTO data part of PhD work of K. Chanthorn and K. Wangnok Search for complimentary data (of known eclipsing WD binaries) part of BSc work of P. Nuchvanichakul Challenges Increasing sky pollution (more notably in March-April) which affects faint targets observation (V>17mag) at TNO search for new brighter systems, use other facilities (i.e. Subaru telescope, 2.1m Xinglong Observatory) Longer monitoring of newly found systems Thai Robotic Telescope Thank you 9
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