IAC science with the prototype SONG node at Tenerife Katrien Uytterhoeven
Embed Size (px)
Transcript of IAC science with the prototype SONG node at Tenerife Katrien Uytterhoeven
IAC science with the prototype SONG node at Tenerife
research group Solar and Stellar Seismology and Extrasolar planet searchesInterests in SONG:
* the Sun-as-a-star* solar-like stars* red giants* SdB stars* Sct, Dor* Cep, SPB* OB supergiants* binaries with pulsating components
* follow-up of planet candidatesSeismologyplanets(7 staff, 2 PostDocs, 3 PhD)
Massive main-sequence pulsators= Dor, Sct, SPB, CepProblem: mode-ID does not rely on regularity of frequency spectrumSeismic study requires identified (l,m) modes! Sct HD50844
Mode-ID via line-profile analysis!
(l,m)* amplitude and phasedistribution across line-profile* velocity moments GOAL: SONG RV time-seriesmode-identification!b) test and improve seismic models
Sun-as-a-star: SONG and Mark-IMark-I * operational at Obs. Teide since 1976* full-time monitoring since 1984* RV of the Sun through potassium KI 769.9 nm line* sampling rate: 2sec
GOAL: daytime solar spectra with SONGa) compare simultaneous (same site!) Mark-I and SONG observations (resample to same sampling rate)
b) evaluate quality and sensitivity of SONG solar observations
Planet transitsSee talk by Brandon!Use SONG photometry to confirm transit candidates through color changes during transit
> 50 staff scientists> 65 post-docs> 35 PhD studentsInterests in SONG from IAC research groups other than the group on Solar and Stellar Seismology and Extrasolar planet searches
twilight sky spectrumHET McDonald observatory* 1 yr solar orbitampl=0.507 km s-1* 1 d Earth orbit(not well covered)+ other deviations!i. Wavelength variations in Solar spectral linesT = 1750 days
Origin of deviations?* changes in granulation properties along solar cycle* presence of planets e.g. Jupiter: 13 m s-1 over 12yr GOAL: twilight sky spectra with SONG and I2 cella) investigate wavelength stability of the solar spectrum
b) demonstrate that deviations due to a Jupiter-size planet can unambigously be found
c) study stellar activity
* Compact Binaries (Porb~hrs), primary is compact object (neutron star, black hole).* Roche-lobe overflow, matter accreted via accretion disk.* Inner accretion disk gives rise to X-rays.* optical emission due to Reprocessing of X-rays in outer accretion disk* Different optical wavelengths probe different parts of the outer accretion diskii. Low mass X-ray binariesRmon Cornelisse
Large night to night changes in lightcurve morphologyGoal: ~1 week continuous multi-colour photometric monitoring with the SONG network a) understand the origin of the lightcurve changes b) understand physics of the accretion diskOrigin? changes in accretion disk due to precession or the presence of a warp?
Nova = thermonuclear explosions on surface of white dwarf accreting mass in a close binary questions:* model that fits at all wavelengths ?T Pyx, lightcurveMagMJD - 2450000* brightening (< V=10mag few weeks)* FeII or He/N line absorption* origin of absorption lines?* mysterious absorption systems (THEA)iii. Classical Novae at maximum lightAlessandro Ederoclite
T Pyx, FIES spectraTime15.04.201130.05.2011GOAL: few SONG spectra per day (without I2 cell) during max light of novae
follow-up optical thick and thin phase
a) describe chemistry
b) describe dynamics of explosion
Well-detached EBs are best calibrators for models of stellar structure and evolution
accurate orbital parameters, M*, R* !BUT! spectral chemical analysis is lacking!GOAL: SONG spectra (without I2 cell) of well-known, bright, well-detached EBs at max separation
derive metallicity and chemical abundances of binary componentscalibrate models stellar structure & evolutioniv. Chemical analysis of EBs Carlos Allende Prieto
v. Multiple populations in globular clustersAntonino MiloneMany globular clusters show multiple sequences!GOAL: SONG spectra of bright stars in GCs (filling program)
derive chemical and dynamical propertiesand try to solve:abundance anomalies multiple sequenceshorizontal branch morphologyCMD of NGC 2808 with isochrones
vi. macroturbulent broadening in OB supergiantsSergio Simn Dazpilot study!signature of collective effect of pulsations?!OB SGs show extra line broadening:macrotubulenceorigin?
GOAL: time-series of SONG spectra of bright OB supergiants understand macroturbulence improve atmosphere models of OB SGsfirst seismic studies of OB SGs!promising!
IAC science many interesting filling programs and additional SONG science programs for SONG-OT!