Resolving the inner dust disks surrounding LkCa 15 and MWC 480 at mm wavelengths

By V. Pi'etu, A. Dutrey, S. Guilloteau, E. Chapillon, Jérome Pety. 2006

155 citations recorded by the source corpus.

Aims. We constrain the dust distribution and its properties (temperature, emissivity) in inner proto-planetary disks Methods. We performed sub-arcsecond high-sensitivity interferometric observations of the thermal dust emission at 1.4 mm and 2.8 mm in the disks surrounding LkCa 15 and MWC 480, with the new 750 m baselines of the IRAM PdBI array. This provides a linear resolution of ∼60 AU at the distance of Taurus. Results. We report the existence of a cavity of ∼50 AU radius in the inner disk of LkCa 15. Whereas LkCa 15 emission is optically thin, the optically thick core of MWC 480 is resolved at 1.4 mm with a radius of ∼35 AU, constraining the dust temperature. In MWC 480, the dust emission is coming from a colder layer than the CO emission, most likely the disk mid-plane. Conclusions. These observations provide direct evidence of an inner cavity around LkCa 15. Such a cavity most probably results from the tidal disturbance created by a low-mass companion or large planet at ∼30 AU from the star. These results suggest that planetary system formation is already at work in LkCa 15. They also indicate that the classical steady-state viscous disk model is too simplistic a description of the inner 50 AU of “proto-planetary” disks and that the disk evolution is coupled to the planet formation process. The MWC 480 results indicate that a proper estimate of the dust temperature and size of the optically thick core are essential for determining the dust emissivity index β.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/41813d2736e4bb2297211c9fbc675b63a1a7949d

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In Astronomy and Astrophysics

1. S. Andrews
2. D. Wilner
3. T. Birnstiel
4. L. Hartmann
5. C. Dullemond
6. A. Hughes
7. K. Luhman
8. N. Calvet

Citations in the corpus

• Millimeter imaging of HD 163296: probing the disk structure and kinematics (2007, background): “…from Keplerian rotation (Piétu et al. 2005; Corder et al. 2005); the classical TTS LkCa15 has a large inner hole of size ∼ 50 AU depleted of dust, while the HAe star MWC 480 has a smooth disk with an optically thick (at millimeter wavelengths) inner region of radius ∼ 35 AU (Piétu et al. 2006).”
• Observational Signatures of Planets in Protoplanetary Disks I: Gaps Opened by Single and Multiple Young Planets in Disks (2014, background): “…Array for Research in Millimeter-wave Astronomy (e.g. Isella et al. 2009, 2010; Ricci et al. 2013), the Plateau de Bure Interferometer (e.g. Piétu et al. 2006; Guilloteau et al. 2011), and the newly commissioned Atacama Large Millimeter Array (ALMA) (e.g. van der Marel et al. 2013;…”
• DUST FILTRATION BY PLANET-INDUCED GAP EDGES: IMPLICATIONS FOR TRANSITIONAL DISKS (2012, result): “…1992; Calvet et al. 2002, 2005; Rice et al. 2003; Schneider et al. 2003; Espaillat et al. 2007, 2008, 2010; Hughes et al. 2009), an interpretation confirmed in some cases via direct sub-mm imaging (e.g., Pietu et al. 2006; Brown et al. 2007, 2009; Hughes et al. 2009; Andrews et al. 2009, 2011).”
• PROTOPLANETARY DISK STRUCTURES IN OPHIUCHUS. II. EXTENSION TO FAINTER SOURCES (2010, background): “…established the presence of vertical temperature and density gradients (Dartois et al. 2003; Piétu et al. 2007), and even identified disks with large central cavities that exhibit very little dust emission (Piétu et al. 2006; Hughes et al. 2007, 2009; Brown et al. 2008, 2009; Isella et al. 2010).”
• Cavity opening by a giant planet in a protoplanetary disc and effects on planetary migration (2007, background): “More recently, interferometric observations at Plateau de Bure Interferometer clearly showed a remarkable dust depletion in the inner 50 au of the disc of LkCa15 (Piétu et al. 2006).”
• THE MASS DEPENDENCE BETWEEN PROTOPLANETARY DISKS AND THEIR STELLAR HOSTS (2013, unknown): “…Looney et al. 2000; Duvert et al. 2000; Motte & André 2001; Klein et al. 2003; Jensen & Akeson 2003; Duchêne et al. 2003, 2010; Corder et al. 2005; Piétu et al. 2005, 2006, 2011; Lin et al. 2006; Moriarty-Schieven et al. 2006; Scholz et al. 2006; Hamidouche et al. 2006; Andrews &…”
• RESOLVED IMAGES OF LARGE CAVITIES IN PROTOPLANETARY TRANSITION DISKS (2011, background): “…structures of transition disks are quite complex, and the few studies aimed at their characterization using spatially resolved data have adopted very different approaches (Piétu et al. 2006; Hughes et al. 2007, 2009a; Brown et al. 2008, 2009; Andrews et al. 2009, 2010a,b; Isella et al. 2010a,b).”
• STRUCTURE AND EVOLUTION OF PRE-MAIN-SEQUENCE CIRCUMSTELLAR DISKS (2009, background): “…DN Tau, DM Tau, LkCa15, UZ Tau E, GM Aur, GSS39, SR24, TW Hya and MWC 275 both inclinations and position angles are in agreement with published values within 2σ (Jensen et al. 1996; Dutrey et al. 1997; Simon et al. 2000; Qi et al. 2004; Piétu et al. 2006; Andrews et al. 2007; Isella et al. 2007).”
• Molecules with ALMA at Planet-forming Scales (MAPS). I. Program Overview and Highlights (2021, background): “Its disk has been characterized through millimeter continuum observations (Piétu et al. 2006), and recent 0.”
• TRANSITIONAL AND PRE-TRANSITIONAL DISKS: GAP OPENING BY MULTIPLE PLANETS? (2010, methodology): “The location of the inner edge of the outer disk inferred from SED modeling is consistent with that derived using millimeter interferometry (Pietu et al. 2006; Andrews et al. 2009; S. Andrews, 2010, private communication).”
• Probing the structure of protoplanetary disks: a comparative study of DM Tau, LkCa 15, and MWC 480 (2007, methodology): “Compared to previous papers (e.g. Simon et al. 2000; Duvert et al. 2000; Dutrey et al. 1998), the new fits include all the refinements of the method described in Sec.3 and in Piétu et al. (2006).”
• UNVEILING THE STRUCTURE OF PRE-TRANSITIONAL DISKS (2010, methodology): “While the truncation of LkCa 15’s outer disk has been imaged in the millimeter (Piétu et al. 2006), Espaillat et al. (2007a) showed that the substantial nearinfrared excess of LkCa 15 could be explained by either optically thick material or by ∼10−11 M⊙ of optically thin dust mixed with the gas in…”
• Possible planet-forming regions on submillimetre images (2011, background): “Note that there exist further examples of discs showing non-axisymmetric submillimetre images, such as LkCa 15 (Piétu et al. 2006), GM Aur (Hughes et al. 2009), SR 24S (Andrews et al. 2010), and J1604-2130 (Williams & Cieza 2011) for which the same phenomenon might be responsible.”
• On the Diversity of the Taurus Transitional Disks: UX Tauri A and LkCa 15 (2007, methodology): “However, the truncation of LkCa 15’s outer disk at ∼46 AU is consistent with resolved millimeter interferometric observations (Piètu et al. 2006) which makes it one of three inner disk holes imaged in the millimeter (TW Hya: Hughes et al. 2007; GM Aur: Wilner et al. in preparation).”
• Complex organic molecules in protoplanetary disks (2013, background): “…peculiar object: the discovery of a large cavity in continuum emission within a radius of ≈ 50 AU has reclassified this object as a transition disk (Piétu et al. 2006) in which planet formation is likely at Article number, page 16 of 34 Catherine Walsh et al.: Complex organic molecules in…”
• Ring shaped dust accumulation in transition disks (2012, background): “The disk has been intensively observed at millimeter wavelengths (Piétu et al. 2006; Andrews et al. 2011b) with a maximum angular resolution corresponding to 28 AU (Isella et al. 2012).”