Consistent Dust and Gas Models for Protoplanetary Disks III. Models for Selected Objects from the FP7 DIANA? Project
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Publication List – Beate Stelzer
PUBLICATION LIST – BEATE STELZER Refereed publications 87. Pizzocaro D., Stelzer B., Paladini R., Tiengo A., Lisini G., Novara G., Vianello G., Belfiore A, Marelli M., Salvetti D., Pillitteri I., Sciortino S., D’Agostino D., Haberl F., Watson M., Wilms J., Salvaterra R., De Luca A. Results from DROXO IV. EXTraS discovery of an X-ray flare from the Class I protostar candidate ISO-Oph 85 2016, A&A 587, A36 86. Antoniucci S., Nucita A.A., Giannini T., Lorenzetti D., Stelzer B., Gerardi D., Delle Rose S., Di Paola A., Giordano M., Manni L., Strafella F. 2015, A&A 584, A21 First X-ray dectection of the young variable V1180 Cas 85. Stelzer B. 2015, AN 336, 493 Variability of young stellar objects: Accretion, disks, outflows, and magnetic activity 84. Osten R., Melis C., Stelzer B., Bannister K.W., Radigan J., Burgasser A.J., Wolszczan A. & Luhman K.L. 2015, ApJ 805, L3 The Deepest Constraints on Radio and X-ray Magnetic Activity in Ultracool Dwarfs from WISE J104915.57-531906.1 83. Borsa F., Scandariato G., Rainer M., ... Stelzer B. 2015, A&A 578A, 64 The GAPS Programme with HARPS-N at TNG. VII. Putting exoplanets in the stellar context: magnetic activity and asteroseismology of τ Bootis A 82. Maldonado J., Affer L., Micela G., Scandariato G., Damasso M., Stelzer B., et al. 2015, A&A 557A, 132 Stellar parameters of early M dwarfs from ratios of spectral features at optical wavelengths 81. Frasca A., Biazzo K., Lanzafame A.C., Alcal´aJ.M., Brugaletta E., Klutsch A., Stelzer B., et al. -
Probing Protoplanetary Disk Upper Atmospheres for Heating and Dust Settling Using Synthetic CO Spectra Josiah Lewis Covenant College
Clemson University TigerPrints Publications Physics and Astronomy 7-1-2010 Probing Protoplanetary Disk Upper Atmospheres for Heating and Dust Settling using Synthetic CO Spectra Josiah Lewis Covenant College Martin Kronberg University of Washington Sean D. Brittain Clemson University, [email protected] Follow this and additional works at: https://tigerprints.clemson.edu/physastro_pubs Part of the Astrophysics and Astronomy Commons Recommended Citation Please use publisher's recommended citation. This Article is brought to you for free and open access by the Physics and Astronomy at TigerPrints. It has been accepted for inclusion in Publications by an authorized administrator of TigerPrints. For more information, please contact [email protected]. Journal of the Southeastern Association for Research in Astronomy, 4, 20-25, 2010 July 1 °c 2010. Southeastern Association for Research in Astronomy. All rights reserved. PROBING PROTOPLANETARY DISK UPPER ATMOSPHERES FOR HEATING AND DUST SETTLING USING SYNTHETIC CO SPECTRA Josiah Lewis1 Covenant College, Box 625, 14049 Scenic Highway, GA 30790 Martin Kronberg1 University of Washington, Seattle, C319 Physics/Astronomy Building, Seattle, WA 98195 and Sean Brittain Department of Physics and Astronomy, Clemson University, Clemson, SC 29634-0978 ABSTRACT CO emission is a useful probe of the warm gas distribution in the planet forming regions of disks around Herbig Ae/Be (HAeBe) stars. We model UV fluoresced and thermally excited CO in the circumstellar disks of several HAeBes. We find indications of dust settling in the upper atmospheres of HD 141569 and HD 97048 and a correlation between PAH luminosity and gas heating in these two systems. Subject headings: circumstellar matter—line: profiles—planetary systems: protoplanetary disks— stars: individual (HD 100546, HD 1415469, HD 97048) 1. -
Arxiv:0808.3207V1 [Astro-Ph] 23 Aug 2008 Nfgr .Nwonsaswr Rtdrcl Icvrdi C in Discovered Directly H first Were and Surroun Stars Variability Area Newborn the of 4
Handbook of Star Forming Regions Vol. II Astronomical Society of the Pacific, 2008 Bo Reipurth, ed. Chamaeleon Kevin L. Luhman Department of Astronomy and Astrophysics The Pennsylvania State University University Park, PA 16802, USA Abstract. The dark clouds in the constellation of Chamaeleon have distances of 160-180pc from the Sun and a total mass of ∼5000 M⊙. The three main clouds, Cha I, II, and III, have angular sizes of a few square degrees and maximum extinctions of AV ∼ 5-10. Most of the star formation in these clouds is occurring in Cha I, with the remainder in Cha II. The current census of Cha I contains 237 known members, 33 of which have spectral types indicative of brown dwarfs (>M6). Approximately 50 members of Cha II have been identified, including a few brown dwarfs. When interpreted with the evolutionary models of Chabrier and Baraffe, the H-R diagram for Cha I exhibits a median age of ∼2 Myr, making it coeval with IC 348 and slightly older than Taurus (∼1 Myr). TheIMF ofChaI reachesa maximumat a massof0.1-0.15 M⊙, and thus closely resembles the IMFs in IC 348 and the Orion Nebula Cluster. The disk fraction in Cha I is roughly constant at ∼ 50% from 0.01 to 0.3 M⊙ and increases to ∼ 65% at higher masses. In comparison, IC 348 has a similar disk fraction at low masses but a much lower disk fraction at M ∼> 1 M⊙, indicating that solar-type stars have longer disk lifetimes in Cha I. 1. Introduction The southern constellation of Chamaeleon contains one of the nearest groups of dark clouds to the Sun (d ∼ 160-180 pc). -
Tetrahedral Hydrocarbon Nanoparticles in Space: X-Ray Spectra
Mon. Not. R. Astron. Soc. 000, 1–7 (2018) Printed 15 October 2018 (MN LATEX style file v2.2) Tetrahedral hydrocarbon nanoparticles in space: X-ray spectra G. Bilalbegovic´1, A. Maksimovic´2, L. A. Valencic3;4 1Department of Physics, Faculty of Science, University of Zagreb, Bijenickaˇ cesta 32, 10000 Zagreb, Croatia 2Center of Excellence for Advanced Materials and Sensing Devices, Rudjer Boskoviˇ c´ Institute, Bijenickaˇ cesta 54, 10000 Zagreb, Croatia 3NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA 4The Johns Hopkins University, Department of Physics & Astronomy, 366 Bloomberg Center, 3400 N. Charles St., Baltimore, MD 21218, USA 15 October 2018 ABSTRACT It has been proposed, or confirmed, that diamond nanoparticles exist in various environ- ments in space: close to active galactic nuclei, in the vicinity of supernovae and pulsars, in the interior of several planets in the Solar system, in carbon planets and other exoplanets, carbon- rich stars, meteorites, in X-ray active Herbig Ae/Be stars, and in the interstellar medium. Using density functional theory methods we calculate the carbon K-edge X-ray absorption spectrum of two large tetrahedral nanodiamonds: C26H32 and C51H52. We also study and test our methods on the astrophysical molecule CH4, the smallest C-H tetrahedral structure. A possible detection of nanodiamonds from X-ray spectra by future telescopes, such as the project Arcus, is proposed. Simulated spectra of the diffuse interstellar medium using Cyg X-2 as a source show that nanodiamonds studied in this work can be detected by Arcus, a high resolution X-ray spectrometer mission selected by NASA for a Phase A concept study. -
Arxiv:1808.00476V1 [Astro-Ph.SR] 1 Aug 2018 Big Ae Stars but Not for Several Herbig Be Stars (Fairlamb Et Al
Astronomy & Astrophysics manuscript no. Vioque_et_al_2018 c ESO 2018 August 3, 2018 Gaia DR2 study of Herbig Ae/Be stars M. Vioque1; 2?, R. D. Oudmaijer1, D. Baines3, I. Mendigutía4, and R. Pérez-Martínez2 1 School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK. 2 Ingeniería de Sistemas para la Defensa de España (Isdefe), XMM/Newton Science Operations Centre, ESA-ESAC Campus, PO Box 78, 28691 Villanueva de la Cañada, Madrid, Spain. 3 Quasar Science Resources for ESA-ESAC, ESAC Science Data Center, PO Box 78, 28691 Villanueva de la Cañada, Madrid, Spain. 4 Centro de Astrobiología (CSIC-INTA), Departamento de Astrofísica, ESA-ESAC Campus, PO Box 78, 28691 Villanueva de la Cañada, Madrid, Spain. Accepted for publication in Astronomy & Astrophysics. ABSTRACT Aims. We use Gaia Data Release 2 (DR2) to place 252 Herbig Ae/Be stars in the HR diagram and investigate their characteristics and properties. Methods. For all known Herbig Ae/Be stars with parallaxes in Gaia DR2, we collected their atmospheric parameters and photometric and extinction values from the literature. To these data we added near- and mid-infrared photometry, collected Hα emission line properties such as equivalent widths and line profiles, and their binarity status. In addition, we developed a photometric variability indicator from Gaia’s DR2 information. Results. We provide masses, ages, luminosities, distances, photometric variabilities and infrared excesses homogeneously derived for the most complete sample of Herbig Ae/Be stars to date. We find that high mass stars have a much smaller infrared excess and have much lower optical variabilities compared to lower mass stars, with the break at around 7M .Hα emission is generally correlated with infrared excess, with the correlation being stronger for infrared emission at wavelengths tracing the hot dust closest to the star. -
HD 97048: a Closer Look at the Disk
A&A 470, 625–631 (2007) Astronomy DOI: 10.1051/0004-6361:20066610 & c ESO 2007 Astrophysics HD 97048: a closer look at the disk C. Doucet1,2, E. Habart3, E. Pantin1,2,C.Dullemond4,P.O.Lagage1,2,C.Pinte5, G.Duchêne5, and F. Ménard5 1 AIM, Unité Mixte de Recherche CEA – CNRS – Université Paris VII – UMR 7158, France e-mail: [email protected] 2 DSM/DAPNIA/service d’Astrophysique, CEA/Saclay, 91191 Gif-sur-Yvette, France 3 Institut d’Astrophysique Spatiale (IAS), 91405 Orsay Cedex, France 4 Max-Planck-Institut fur Astronomie Heidelberg, Konigstuhl 17, Heidelberg, Germany 5 Laboratoire d’Astrophysique de Grenoble, CNRS/UJF UMR 5571, Grenoble, France Received 20 October 2006 / Accepted 30 April 2007 ABSTRACT Aims. Large ground-based instruments, like VISIR on the VLT, providing diffraction-limited (∼0.3 arcsec) images in the mid-infrared where strong PAH features appear, enable us to see the flaring structure of the disks around Herbig Ae stars. Although progress has been made in modelling the disk with radiative transfer models able to reproduce the spectral energy distribution (SED) of Herbig Ae stars, the constraints brought by images have not been yet fully exploited. We investigate whether these new observational imaging constraints can be accounted for by predictions based on existing models of passive, centrally irradiated hydrostatic disks made to fit the SEDs of the Herbig Ae stars. Methods. The images taken by VISIR in the 8.6 and 11.3 µm aromatic features reveal a large flaring disk around HD 97048 inclined to the line of sight. -
Arxiv:0708.0266V1 [Astro-Ph] 2 Aug 2007 5 H,Cnd;[email protected]
submitted to ApJ A Comprehensive View of Circumstellar Disks in Chamaeleon I: Infrared Excess, Accretion Signatures and Binarity Ivana Damjanov1, Ray Jayawardhana1, Alexander Scholz2, Mirza Ahmic1, Duy C. Nguyen1, Alexis Brandeker3, Marten H. van Kerkwijk1 ABSTRACT We present a comprehensive study of disks around 81 young low-mass stars and brown dwarfs in the nearby ∼2 Myr-old Chamaeleon I star-forming region. We use mid-infrared photometry from the Spitzer Space Telescope, supplemented by findings from ground-based high-resolution optical spectroscopy and adaptive +6 optics imaging. We derive disk fractions of 52% ± 6% and 58−7% based on 8 µm and 24 µm colour excesses, respectively, consistent with those reported for other clusters of similar age. Within the uncertainties, the disk frequency in our sample of K3–M8 objects in Cha I does not depend on stellar mass. Diskless and disk-bearing objects have similar spatial distributions. There are no obvious transition disks in our sample, implying a rapid timescale for the inner disk clearing process; however, we find two objects with weak excess at 3–8 µm and substantial excess at 24 µm, which may indicate grain growth and dust settling in the inner disk. For a sub-sample of 35 objects with high-resolution spectra, we investigate the connection between accretion signatures and dusty disks: in the arXiv:0708.0266v1 [astro-ph] 2 Aug 2007 vast majority of cases (29/35) the two are well correlated, suggesting that, on average, the timescale for gas dissipation is similar to that for clearing the inner dust disk. The exceptions are six objects for which dust disks appear to persist even though accretion has ceased or dropped below measurable levels. -
Planet Formation Phil Armitage
Planet Formation Phil Armitage Colorado è Stony Brook / Simons CCA overview • stone age planet formation – formation of planetary systems from a smooth radial distribution of km-scale planetesimals embedded in gas, with no migration • planetesimal • planetesimals formation or pebbles? • migration • gas accretion How do we form observed systems? Is there a timing problem? classical planet formation Adopt effective initial conditions: radially smooth distribution of small (100m – km) planetesimals embedded in gas, which acts to damp {e,i} but does not cause migration • growth phases: runaway, oligarchic final assembly / giant impacts • if fast enough final outcome is ~determined by stability M 1/3 r = p a Hill 3M ✓ ⇤ ◆ 1/4 tinstability = f(∆a/Mp ) • collisions make a small-N system more stable classical planet formation t / Myr 100 Ratio of collisions to scatterings is 10 f(vK / vesc), favors collisions for MSun at a ~ AU and less 1 “in situ” formation e 1 AU 2 AU 3 AU • disk with a few ME / AU at 1 AU will work • requirement of stability can hide a multitude of sins • many important but lesser constraints (small mass of Mars…) classical planet formation quasi-static envelope extends to rHill, rBondi core grows from accretion of planetesimals cooling is limited by grain opacity in radiative zone in the envelope “success” requires reaching Menv ~ Mcore ~ 5-20 ME within gas disk lifetime possible at few AU if the gravitational focusing factor 2 [1 + (vesc / σ) ] is large (small planetesimals) and κ low what’s wrong with this story? • major -
Detection of Water Ice Grains on the Surface of the Circumstellar Disk Around Hd 142527∗
The Astrophysical Journal, 690:L110–L113, 2009 January 10 doi:10.1088/0004-637X/690/2/L110 c 2009. The American Astronomical Society. All rights reserved. Printed in the U.S.A. DETECTION OF WATER ICE GRAINS ON THE SURFACE OF THE CIRCUMSTELLAR DISK AROUND HD 142527∗ M. Honda1,A.K.Inoue2, M. Fukagawa3,A.Oka4, T. Nakamoto4, M. Ishii5, H. Terada5, N. Takato5, H. Kawakita6, Y. K. Okamoto7, H. Shibai3, M. Tamura8,T.Kudo8, and Y. Itoh9 1 Department of Information Science, Kanagawa University, 2946 Tsuchiya, Hiratsuka, Kanagawa 259-1293, Japan; [email protected] 2 College of General Education, Osaka Sangyo University, 3-1-1, Nakagaito, Daito, Osaka 574-8530, Japan 3 Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan 4 Department of Earth and Planetary Science, Tokyo Institute of Technology, Ookayama, Meguro, Tokyo 152-8551, Japan 5 Subaru Telescope, National Astronomical Observatory of Japan, 650 North A’ohoku Place, Hilo, HI 96720, USA 6 Department of Physics, Kyoto Sangyo University, Motoyama, Kamogamo, Kita-ku, Kyoto 603-8555, Japan 7 Institute of Astrophysics and Planetary Sciences, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan 8 National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan 9 Graduate School of Science, Kobe University, 1-1 Rokkodai, Kobe, Hyogo 657-8501, Japan Received 2008 July 31; accepted 2008 November 18; published 2008 December 19 ABSTRACT Coronagraphic imaging for the Herbig Ae star, HD 142527, was performed using the Coronagraphic Imager with Adaptive Optics (CIAO) on the 8.2 m Subaru Telescope. -
HD 97048'S CIRCUMSTELLAR ENVIRONMENT AS REVEALED BY
The Astronomical Journal, 133:2122 Y2131, 2007 May A # 2007. The American Astronomical Society. All rights reserved. Printed in U.S.A. HD 97048’s CIRCUMSTELLAR ENVIRONMENT AS REVEALED BY A HUBBLE SPACE TELESCOPE ACS CORONAGRAPHIC STUDY OF DISK CANDIDATE STARS R. L. Doering,1, 2 M. Meixner,2 S. T. Holfeltz,2 J. E. Krist,3 D. R. Ardila,4 I. Kamp,5 M. C. Clampin,6 and S. H. Lubow2 Received 2006 July 14; accepted 2007 January 6 ABSTRACT We present the results of a coronagraphic scattered-light imaging survey of six young disk candidate stars using the Hubble Space Telescope Advanced Camera for Surveys. The observations made use of the 1.800 occulting spot through the F606W (broad V ) filter. Circumstellar material was imaged around HD 97048, a Herbig Ae/Be star located in the Chamaeleon I dark cloud at a distance of 180 pc. The material is seen between 200 (360 AU) and 400 (720 AU) from the star in all directions. A V-band azimuthally averaged radial surface brightness profile peaks at r ¼ 200 with a value of 19:6 Æ 0:2 mag arcsecÀ2 and smoothly decreases with projected distance from the star as I / rÀ3:3Æ0:5. An inte- grated flux of 16:8 Æ 0:1 mag is measured between 200 and 400, corresponding to a scattered-light fractional luminosity À4 lower limit of Lsca /LÃ > 8:4 ; 10 . Filamentary structure resembling spiral arms similar to that seen in Herbig Ae/Be disks is observed. Such structure has been attributed to the influence of orbiting planets or stellar encounters. -
Co Gas Inside the Protoplanetary Disk Cavity in Hd 142527: Disk Structure from Alma
Preprint typeset using LATEX style emulateapj v. 12/16/11 CO GAS INSIDE THE PROTOPLANETARY DISK CAVITY IN HD 142527: DISK STRUCTURE FROM ALMA S. PEREZ1,2 , S. CASASSUS1,2 , F. MENARD´ 2,3,4 , P. ROMAN2,6 , G. VAN DER PLAS1,2 , L. CIEZA2,5 , C. PINTE3,4 , V. CHRISTIAENS1,2 , A. S. HALES2,7 . 1 Departamento de Astronom´ıa, Universidad de Chile, Casilla 36-D, Santiago, Chile 2 Millenium Nucleus “Protoplanetary Disks in ALMA Early Science,” Universidad de Chile, Casilla 36-D, Santiago, Chile 3 UMI-FCA 3386, CNRS/INSU, Casilla 36-D, Santiago, Chile 4 Univ. Grenoble Alpes, IPAG, F-38000 Grenoble, France CNRS, IPAG, F-38000 Grenoble, France 5 Universidad Diego Portales, Facultad de Ingenier´ıa, Av. Ejercito´ 441, Santiago, Chile 6 Center of Mathematical Modelling, Universidad de Chile. and 7 Joint ALMA Observatory, Alonso de Cordoba´ 3107, Vitacura 763-0355, Santiago, Chile ABSTRACT Inner cavities and annular gaps in circumstellar disks are possible signposts of giant planet formation. The young star HD 142527 hosts a massive protoplanetary disk with a large cavity that extends up to 140 au from the central star, as seen in continuum images at infrared and millimeter wavelengths. Estimates of the survival of gas inside disk cavities are needed to discriminate between clearing scenarios. We present a spatially and spectrally resolved carbon monoxide isotopologue observations of the gas-rich disk HD 142527, in the J = 2 − 1 line of 12CO, 13CO and C18O, obtained with the Atacama Large Millimeter/submillimeter Array (ALMA). We detect emission coming from inside the dust-depleted cavity in all three isotopologues. -
A Study of Herbig Ae Be Star HD 163296: Variability in CO and OH Diana Lyn Hubis Yoder Clemson University, [email protected]
Clemson University TigerPrints All Theses Theses 5-2016 A Study of Herbig Ae Be Star HD 163296: Variability in CO and OH Diana Lyn Hubis Yoder Clemson University, [email protected] Follow this and additional works at: https://tigerprints.clemson.edu/all_theses Recommended Citation Hubis Yoder, Diana Lyn, "A Study of Herbig Ae Be Star HD 163296: Variability in CO and OH" (2016). All Theses. 2348. https://tigerprints.clemson.edu/all_theses/2348 This Thesis is brought to you for free and open access by the Theses at TigerPrints. It has been accepted for inclusion in All Theses by an authorized administrator of TigerPrints. For more information, please contact [email protected]. A Study of Herbig Ae Be Star HD 163296 Variability in CO and OH A Thesis Presented to the Graduate School of Clemson University In Partial Fulfillment of the Requirements for the Degree Master of Science Physics and Astronomy by Diana Lyn Hubis Yoder May 2016 Accepted by: Dr. Sean Brittain, Committee Chair Dr. Mark Leising Dr. Jeremy King Dr. Chad Sosolik Abstract Spectra of the Herbig Ae Be star HD 163296 show variability in the CO and OH ro-vibrational emission lines. Documented here is the variance of OH emission lines between measurements separated by a period of three years. By comparing this variability to the variability of CO, we aim to determine whether the two are linked through an event such as disk winds. We find the profiles of OH and CO taken within three months of each other to have exceedingly similar profile shapes. However, the variability seen between the OH data sets needs further work to verify whether the changes we see are reproducible.