Constraining the wind launching region in Herbig Ae

Constraining the wind launching region in Herbig Ae stars: AMBER/VLTI spectroscopy of HD 104237 E. Tatulli, A. Isella, A. Natta & AMBER consortium 2007, A&A, 464, 55

Introduction HD 141569 HD 163296 HD 142527 : : Andrea Isella : : Grenoble – AMBER workshop, 17 September 2020 : :

Introduction Gas accretes on the central star: Continuum UV emission – veiling Hydrogen ricombination lines (H , Br ) IR molecular line emission (CO, H 2 O) Stellar variability Jets and outflow (angular momentum dissipation) Can be spatially and spectrally resolved by AMBER : : Andrea Isella : : Grenoble – AMBER workshop, 17 September 2020 : :

HD 104237 • Herbig Ae (A 4 -A 8, SED, UV emission lines) • distance = 116 pc • age = 5 Myr • mass = 2. 5 M • incl = 18° 14° • v · sin i = 12 2 km/sec • v = 30 – 130 Km/sec • B = 50 G t 106 yr : : Andrea Isella : : Grenoble – AMBER workshop, 17 September 2020 : :

HD 104237 • Herbig Ae (A 4 -A 8, SED, UV emission lines) • Jet seen in Ly- [Grady et al. (2004)] • H emission with P-cygni profile [Feigelson et al. 2003)] • Spectroscopic K companion [Böhm et al. (2003)] orbiting in 20 days, L 1/L 2 = 10, m 1/m 2 = 1. 3 • Br emission with single peak profile Fline/Fcont = 35% [ISAAC spectrum] Which is the region responsable for the Br emission ? : : Andrea Isella : : Grenoble – AMBER workshop, 17 September 2020 : :

AMBER observations • Base line = 35 m, = /2 B = 6 mas : : spec. binary =1. 3 mas unresolved • K = 4. 6 detection limit : : fringes in 25% frames • One calibrator + VLTI vibrations absolute visibility calibration not reliable differential visibility not affected if the disk is resolved ! continuum calibration from puffed-up inner rim model [Isella & Natta, 2005] : : Andrea Isella : : Grenoble – AMBER workshop, 17 September 2020 : :

IR continuum emission model • Puffed-up inner rim : : Natta et al. (2001), Tuthill et al. (2001), Dullemond et al. (2001), Millan-Gabet et al. (2001), Eisner et al. (2003), Isella et al. (2006), Monnier et al. (2006) The rim dominate the NIR emission : : Andrea Isella : : Grenoble – AMBER workshop, 17 September 2020 : :

IR continuum emission model : : Andrea Isella : : Grenoble – AMBER workshop, 17 September 2020 : :

Br emission : : magnetospheric accretion • From Rstar to the corotational/magnetospheric radius (~ 0. 1 AU) No! : : Andrea Isella : : Grenoble – AMBER workshop, 17 September 2020 : :

Br emission : : gas within the disk • From Rcorot to Rrim (~ 0. 45 AU) [Najita et al. (2007 at PPV)] Ni! : : Andrea Isella : : Grenoble – AMBER workshop, 17 September 2020 : :

Br emission : : outflowing wind : : Andrea Isella : : Grenoble – AMBER workshop, 17 September 2020 : :

… Thank you for your attention …