The Star-grazing Extrasolar Comets in the Hd 100546 System
نویسندگان
چکیده
Redshifted absorption proÐles that resemble the high-velocity circumstellar gas features in the spectrum of b Pictoris have been detected in IUE data for the 10 Myr old Herbig Be star, HD 100546, on 1995 March 7. In addition to Mg II, Si II, and other refractory species similar to those seen in b Pic, the HD 100546 spectra are rich in accreting gas proÐles from neutral atomic gas, including C I and O I, as well as mildly refractory species such as Zn II and S II. The presence of accreting gas proÐles, including neutral atomic gas, is consistent with detection of comae of star-grazing bodies potentially resembling either comets or asteroids. Overall, the IUE data for HD 100546 are consistent with the planetesimals in this system being more volatile-rich and magnesium-rich than similar bodies in the b Pic system. Subject headings : circumstellar matter È planetary systems È stars : individual (HD 100546) È stars : preÈmain-sequence È ultraviolet : stars
منابع مشابه
The Star - Grazing Extra - Solar Comets in the Hd 100546
Redshifted, absorption prooles resembling the high velocity circumstellar gas features in the spectrum of Pic have been detected in IUE data for the 2 Myr-old Herbig Be star, HD 100546, on 1995 March 7. In addition to Mg II, Si II, and other refractory species similar to those seen in Pic, the HD 100546 spectra are rich in accreting gas prooles from neutral, atomic gas including C I, and 0 I, a...
متن کاملSpectroscopic study of the Herbig Be star HD 100546 ?
We present new results of a spectroscopic investigation performed for the ≈10 Myr old Herbig Be star HD 100546. The data were collected during the period from 1992 to 1995 and consist of 80 high resolution spectra for Hα, Hβ, He i 5876Å, and Na i D lines. The line profiles show rather significant variability on time scales from less than a day to months. The analysis of these data gave argument...
متن کاملTracing the Inner Edge of the Disk around Hd 100546 with Ro-vibrational Co Emission Lines
In this paper we present high resolution 4.7μm spectra of the isolated Herbig Be star HD 100546. HD 100546 has been the subject of intense scrutiny because it is a young nearby star with a transitional disk. We observe the ∆v=1 ro-vibrational CO transitions in order to clarify the distribution of warm gas in the inner disk. Modeling of the CO spectrum indicates that the gas is vibrationally exc...
متن کاملDriving Spiral Arms in the Debris Disks of Hd 100546 and Hd 141569a
With 2D hydrodynamic simulations we explore two scenarios for exciting the observed spiral structure in the large ∼ 400AU sized debris disks of HD 100546 and HD 141569A. We consider spiral structure driven by an external bound low mass planet or star and that excited by a previous stellar encounter or flyby. The spiral structure of HD 141569A is fairly well reproduced with tidal perturbations f...
متن کاملResolving the disk rotation of HD 97048 and HD 100546 in the [ O ] 6300 Å line : evidence for a giant planet orbiting HD 100546 ⋆
Aims. We intend to spatially and spectrally resolve the [O ] emission region in two nearby Herbig stars. Methods. We present high-resolution (λ/∆λ = 80,000) VLT/UVES echelle spectra of the [O ] 6300Å line in the Herbig Ae/Be stars HD 97048 and HD 100546. Apart from the spectral signature, also the spatial extent of the [O ] emission region is investigated. For both stars, we have obtained sp...
متن کامل