DISCOVERY OF SMALL-SCALE SPIRAL STRUCTURES IN THE DISK OF SAO 206462 (HD 135344B): IMPLICATIONS FOR THE PHYSICAL STATE OF THE DISK FROM SPIRAL DENSITY WAVE THEORY

By T. Muto, C. Grady, J. Hashimoto, M. Fukagawa, J. Hornbeck, M. Sitko, R. Russell, C. Werren, M. Curé, T. Currie and 52 more. 2012

267 citations recorded by the source corpus.

We present high-resolution, H-band imaging observations, collected with Subaru/HiCIAO, of the scattered light from the transitional disk around SAO 206462 (HD 135344B). Although previous sub-mm imagery suggested the existence of a dust-depleted cavity at r ⩽ 46 AU, our observations reveal the presence of scattered light components as close as 0.″2 (∼ 28 AU) from the star. Moreover, we have discovered two small-scale spiral structures lying within 0.″5 (∼ 70 AU). We present models for the spiral structures using the spiral density wave theory, and derive a disk aspect ratio of h ∼ 0.1, which is consistent with previous sub-mm observations. This model can potentially give estimates of the temperature and rotation profiles of the disk based on dynamical processes, independently from sub-mm observations. It also predicts the evolution of the spiral structures, which can be observable on timescales of 10–20 years, providing conclusive tests of the model. While we cannot uniquely identify the origin of these spirals, planets embedded in the disk may be capable of exciting the observed morphology. Assuming that this is the case, we can make predictions on the locations and, possibly, the masses of the unseen planets. Such planets may be detected by future multi-wavelength observations.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/21c688c317088eaad3b9d4063a7c3483857ca564

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

Citations in the corpus

Global simulations of protoplanetary disks with net magnetic flux: I. Non-ideal MHD case (2016, background): “These images have unveiled a number of features, such as spiral arms (Muto et al. 2012; Benisty et al. 2015), asymmetric dust concentrations (van der Marel et al. 2013; Fukagawa et al. 2013), or axisymmetric rings (Brogan et al. 2015; Nomura et al. 2016).”
Small vs. large dust grains in transitional disks: do different cavity sizes indicate a planet? - SAO 206462 (HD 135344B) in polarized light with VLT/NACO (2013, methodology): “In fact, Muto et al. (2012) and Grady et al. (2013) estimated the locati n of the possible planet exciting spiral arms (of SAO 206462 and MWC 758, respectively) to be outside of the spirals themselves.”
The Disk Substructures at High Angular Resolution Project (DSHARP). II. Characteristics of Annular Substructures (2018, background): “…arms, and high-contrast azimuthal asymmetries, have fueled interest in using observed disk morphologies to infer the properties of an unseen population of newly-forming planets (e.g., Muto et al. 2012; van der Marel et al. 2013; ALMA Partnership et al. 2015; Isella et al. 2016). ar X iv :1 81 2.”
STRUCTURES IN THE PROTOPLANETARY DISK OF HD142527 SEEN IN POLARIZED SCATTERED LIGHT (2013, unknown): “…light in scattered-light observations and has recently been successfully applied to several protoplanetary disks (e.g., Quanz et al. 2011, 2012, 2013; Hashimoto et al. 2011, 2012; Muto et al. 2012; Tanii et al. 2012; Kusakabe et al. 2012; Mayama et al. 2012; Grady et al. 2013; Garufi et al. 2013).”
Shadows and spirals in the protoplanetary disk HD 100453 (2016, background): “…HD 100453 (Wagner et al. 2015a, this work); AB Aur (Hashimoto et al. 2011); HD 142527 (Canovas et al. 2013; Avenhaus et al. 2014); SAO 206462 (Muto et al. 2012; Garufi et al. 2013; Stolker et al. 2016a); MWC 758 (Grady et al. 2013; Benisty et al. 2015), and HD 100546 (Ardila et al. 2007;…”
Imaging Extrasolar Giant Planets (2016, background): “′′1 with exceptional clarity (e.g., Thalmann et al. 2010; Hashimoto et al. 2011; Mayama et al. 2012; Muto et al. 2012).”
The Disk Substructures at High Angular Resolution Project (DSHARP). I. Motivation, Sample, Calibration, and Overview (2018, background): “Similar features have been identified from the IR starlight scattered off the disk atmospheres (e.g., Muto et al. 2012; Grady et al. 2013; Quanz et al. 2013; Avenhaus et al. 2014; Rapson et al. 2015; Benisty et al. 2015; de Boer et al. 2016; Ginski et al. 2016; Akiyama et al. 2016).”
Discovery of a planetary-mass companion within the gap of the transition disk around PDS 70 (2018, background): “…et al. 2017b; Hendler et al. 2018), azimuthal asymmetries (e.g. Casassus et al. 2013; van der Marel et al. 2013; Pérez et al. 2014), spirals (e.g. Muto et al. 2012; Grady et al. 2013; Tang et al. 2017), and multiple rings (e.g. de Boer et al. 2016; Ginski et al. 2016; Andrews et al. 2016; van…”
Dust Evolution and the Formation of Planetesimals (2016, background): “…disks that show gaps/holes in the (sub-)millimeter interferometric data lack evidence of evolved inner disks in H-band polarized intensity images (Muto et al. 2012; Follette et al. 2013), which may be due to the decoupling between the spatial distributions of the small (µm) and big (mm) dust…”
LARGE-SCALE ASYMMETRIES IN THE TRANSITIONAL DISKS OF SAO 206462 AND SR 21 (2014, unknown): “Recently, scattered light observations of the polarized intensity at near-IR wavelengths revealed spirallike structure in the outer disk of SAO 206462 (Muto et al. 2012; Garufi et al. 2013).”
On the diversity and statistical properties of protostellar discs (2018, unknown): “…M. R. Bate Sinks 2, 21 jects and transition discs include: AB Aur (Hashimoto et al. 2011), MWC 758 (Grady et al. 2013; Benisty et al. 2015), SAO 206462 (Muto et al. 2012; Garufi et al. 2013; Stolker et al. 2016), HD 100546 (Boccaletti et al. 2013; Avenhaus et al. 2014; Currie et al. 2015; Garufi…”
Observational Signatures of Planets in Protoplanetary Disks I: Gaps Opened by Single and Multiple Young Planets in Disks (2014, background): “…Avenhaus et al. 2014) and Subaru (the Subaru Strategic Exploration of Exoplanets and Disks Survey, Tamura 2009; Tsukagoshi et al. 2014; Takami et al. 2013; Follette et al. 2013; Grady et al. 2013; Tanii et al. 2012; Mayama et al. 2012; Kusakabe et al. 2012; Muto et al. 2012; Hashimoto et al. 2011).”
Resolved gas cavities in transitional disks inferred from CO isotopologs with ALMA (2015, background): “The radius of ∼100 AU coincides with a suggested planet that is launching one of the spiral arms observed in scattered-light observations (Muto et al. 2012).”
OBSERVATIONAL SIGNATURES OF PLANETS IN PROTOPLANETARY DISKS: SPIRAL ARMS OBSERVED IN SCATTERED LIGHT IMAGING CAN BE INDUCED BY PLANETS (2015, background): “In general, the morphology of the inner arms is quite similar to the observed ones in SAO 206462 (Muto et al. 2012; Garufi et al. 2013) and MWC 758 (Grady et al. 2013; Benisty et al. 2015), in terms of (1) the rough m = 2 symmetry, (2) pitch angle, and (3) azimuthal extension.”
Photodissociation and photoionisation of atoms and molecules of astrophysical interest (2017, background): “Disks also show additional complex spatial structures seen in small and large grains being influenced by planetary bodies or dynamical instabilities (e.g., Johansen et al. 2007; Andrews et al. 2011; Muto et al. 2012; van der Marel et al. 2013; Pinilla et al. 2015).”
Gas density drops inside dust cavities of transitional disks around young stars observed with ALMA (2015, background): “Garufi et al. (2013) and Muto et al. (2012) show signatures of spiral arms in the scattered lightimages.”
Gravitational Instabilities in Circumstellar Disks (2016, background): “Muto et al. (2012) and Wagner et al. (2015) find evidence for spiral structure in scattered light images of transition disks.”