Nicole Arulanantham
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View article: JWST-TST High Contrast: Medium-resolution spectroscopy reveals a carbon-rich circumplanetary disk around the young accreting exoplanet Delorme 1 AB b
JWST-TST High Contrast: Medium-resolution spectroscopy reveals a carbon-rich circumplanetary disk around the young accreting exoplanet Delorme 1 AB b Open
Young accreting planetary-mass objects are thought to draw material from a circumplanetary disk (CPD) composed of gas and dust. While the gas within the disk is expected to disperse within the first million years, strong accretion has none…
View article: The JDISC Survey: Linking the Physics and Chemistry of Inner and Outer Protoplanetary Disk Zones
The JDISC Survey: Linking the Physics and Chemistry of Inner and Outer Protoplanetary Disk Zones Open
Mid-infrared spectroscopy of protoplanetary disks provides a chemical inventory of gas within a few astronomical unit, where planets are readily detected around older stars. With the James Webb Space Telescope (JWST) Disk Infrared Spectral…
View article: The edge-on disc Tau 042021: Icy grains at high altitudes and a wind containing astronomical polycyclic aromatic hydrocarbons
The edge-on disc Tau 042021: Icy grains at high altitudes and a wind containing astronomical polycyclic aromatic hydrocarbons Open
Context . Spectra of the nearly edge-on protoplanetary discs observed with the JWST have shown ice absorption bands of varying optical depths and peculiar profiles, challenging radiative transfer modelling and our understanding of dust and…
View article: Emission from Multiple Molecular Isotopologues in a High-inclination Protoplanetary Disk
Emission from Multiple Molecular Isotopologues in a High-inclination Protoplanetary Disk Open
We present a MIRI-MRS spectrum of the high-inclination protoplanetary disk around the solar-mass (K0) star MY Lup, obtained as part of the JWST Disk Infrared Spectral Chemistry Survey (JDISCS). The spectrum shows an unusually weak water em…
View article: Water in Protoplanetary Disks with JWST-MIRI: Spectral Excitation Atlas and Radial Distribution from Temperature Diagnostic Diagrams and Doppler Mapping
Water in Protoplanetary Disks with JWST-MIRI: Spectral Excitation Atlas and Radial Distribution from Temperature Diagnostic Diagrams and Doppler Mapping Open
This work aims at providing fundamental general tools for the analysis of water spectra as observed in protoplanetary disks with JWST-MIRI. We analyze 25 high-quality spectra from the JDISC Survey reduced with asteroid calibrators as prese…
View article: Emission from multiple molecular isotopologues in a high-inclination protoplanetary disk
Emission from multiple molecular isotopologues in a high-inclination protoplanetary disk Open
We present a MIRI-MRS spectrum of the high-inclination protoplanetary disk around the solar-mass (K0) star MY Lup, obtained as part of the JWST Disk Infrared Spectral Chemistry Survey (JDISCS). The spectrum shows an unusually weak water em…
View article: JWST/MIRI Detection of a Carbon-rich Chemistry in the Disk of a Solar Nebula Analog
JWST/MIRI Detection of a Carbon-rich Chemistry in the Disk of a Solar Nebula Analog Open
It has been proposed, and confirmed by multiple observations, that disks around low-mass stars display a molecule-rich emission and carbon-rich disk chemistry as compared to their hotter, more massive solar counterparts. In this work, we p…
View article: A Model of the C iv λ λ1548, 1550 Doublet Line in T Tauri Stars
A Model of the C iv λ λ1548, 1550 Doublet Line in T Tauri Stars Open
The C iv doublet in the UV has long been associated with accretion in T Tauri stars. However, it is still unclear where and how the lines are formed. Here, we present a new C iv line model based on the currently available accretion shock a…
View article: Retrieval of Thermally Resolved Water Vapor Distributions in Disks Observed with JWST-MIRI
Retrieval of Thermally Resolved Water Vapor Distributions in Disks Observed with JWST-MIRI Open
The mid-infrared water vapor emission spectrum provides a novel way to characterize the delivery of icy pebbles toward the innermost (<5 au) regions of planet-forming disks. Recently, JWST MIRI-MRS showed that compact disks exhibit an exce…
View article: JWST/MIRI detection of a carbon-rich chemistry in a solar nebula analog
JWST/MIRI detection of a carbon-rich chemistry in a solar nebula analog Open
It has been proposed, and confirmed by multiple observations, that disks around low mass stars display a molecule-rich emission and carbon-rich disk chemistry as compared to their hotter, more massive solar counterparts. In this work, we p…
View article: Water in protoplanetary disks with JWST-MIRI: spectral excitation atlas and radial distribution from temperature diagnostic diagrams and Doppler mapping
Water in protoplanetary disks with JWST-MIRI: spectral excitation atlas and radial distribution from temperature diagnostic diagrams and Doppler mapping Open
This work aims at providing fundamental general tools for the analysis of water spectra as observed in protoplanetary disks with JWST-MIRI. We analyze 25 high-quality spectra from the JDISC Survey reduced with asteroid calibrators as prese…
View article: A Model of the C IV $λλ$ 1548, 1550 Doublet Line in T Tauri Stars
A Model of the C IV $λλ$ 1548, 1550 Doublet Line in T Tauri Stars Open
The C IV doublet in the UV has long been associated with accretion in T Tauri stars. However, it is still unclear where and how the lines are formed. Here, we present a new C IV line model based on the currently available accretion shock a…
View article: Retrieval of Thermally-Resolved Water Vapor Distributions in Disks Observed with JWST-MIRI
Retrieval of Thermally-Resolved Water Vapor Distributions in Disks Observed with JWST-MIRI Open
The mid-infrared water vapor emission spectrum provides a novel way to characterize the delivery of icy pebbles towards the innermost ($<5$ au) regions of planet-forming disks. Recently, JWST MIRI-MRS showed that compact disks exhibit an e…
View article: JWST MIRI MRS Images of Disk Winds, Water, and CO in an Edge-on Protoplanetary Disk
JWST MIRI MRS Images of Disk Winds, Water, and CO in an Edge-on Protoplanetary Disk Open
We present JWST MIRI MRS observations of the edge-on protoplanetary disk around the young subsolar-mass star Tau 042021, acquired as part of the Cycle 1 GO program “Mapping Inclined Disk Astrochemical Signatures.” These data resolve the mi…
View article: Erratum: “Flares, Rotation, Activity Cycles, and a Magnetic Star–Planet Interaction Hypothesis for the Far-ultraviolet Emission of GJ 436” (2023, AJ, 165, 146)
Erratum: “Flares, Rotation, Activity Cycles, and a Magnetic Star–Planet Interaction Hypothesis for the Far-ultraviolet Emission of GJ 436” (2023, AJ, 165, 146) Open
View article: High-contrast JWST-MIRI Spectroscopy of Planet-forming Disks for the JDISC Survey
High-contrast JWST-MIRI Spectroscopy of Planet-forming Disks for the JDISC Survey Open
The JWST Disk Infrared Spectral Chemistry Survey (JDISCS) aims to understand the evolution of the chemistry of inner protoplanetary disks using the Mid-InfraRed Instrument (MIRI) on the James Webb Space Telescope (JWST). With a growing sam…
View article: First detection and modeling of spatially resolved Lyαin TW Hya
First detection and modeling of spatially resolved Lyαin TW Hya Open
Lyman-α (Lyα) is the strongest emission line in the accretion-generated UV spectra from T-Tauri stars and, as such, plays a critical role in regulating chemistry within the surrounding protoplanetary disks. Due to its resonant nature, the …
View article: JWST MIRI MRS Images Disk Winds, Water, and CO in an Edge-On Protoplanetary Disk
JWST MIRI MRS Images Disk Winds, Water, and CO in an Edge-On Protoplanetary Disk Open
We present JWST MIRI MRS observations of the edge-on protoplanetary disk around the young sub-solar mass star Tau 042021, acquired as part of the Cycle 1 GO program "Mapping Inclined Disk Astrochemical Signatures (MIDAS)." These data resol…
View article: X-Ray, Near-ultraviolet, and Optical Flares Produced by Colliding Magnetospheres in the Young High-eccentricity Binary DQ Tau
X-Ray, Near-ultraviolet, and Optical Flares Produced by Colliding Magnetospheres in the Young High-eccentricity Binary DQ Tau Open
DQ Tau is a unique young high-eccentricity binary system that exhibits regular magnetic reconnection flares and pulsed accretion near periastron. We conducted NuSTAR, Swift, and Chandra observations during the 2022 July 30 periastron to ch…
View article: Water-rich Disks around Late M Stars Unveiled: Exploring the Remarkable Case of Sz 114
Water-rich Disks around Late M Stars Unveiled: Exploring the Remarkable Case of Sz 114 Open
We present an analysis of the JDISCS JWST/MIRI-MRS spectrum of Sz 114, an accreting M5 star surrounded by a large dust disk with a shallow gap at ∼39 au. The spectrum is molecule-rich; we report the detection of water, CO, CO 2 , HCN, C 2 …
View article: High-contrast JWST-MIRI spectroscopy of planet-forming disks for the JDISC Survey
High-contrast JWST-MIRI spectroscopy of planet-forming disks for the JDISC Survey Open
The JWST Disk Infrared Spectral Chemistry Survey (JDISCS) aims to understand the evolution of the chemistry of inner protoplanetary disks using the Mid-InfraRed Instrument (MIRI) on the James Webb Space Telescope (JWST). With a growing sam…
View article: First Detection and Modeling of Spatially Resolved Ly$α$ in TW Hya
First Detection and Modeling of Spatially Resolved Ly$α$ in TW Hya Open
Lyman-$α$ (Ly$α$) is the strongest emission line in the accretion-generated UV spectra from T-Tauri stars and, as such, plays a critical role in regulating chemistry within the surrounding protoplanetary disks. Due to its resonant nature, …
View article: Water-Rich Disks around Late M-stars Unveiled: Exploring the Remarkable Case of Sz114
Water-Rich Disks around Late M-stars Unveiled: Exploring the Remarkable Case of Sz114 Open
We present an analysis of the JDISC JWST/MIRI-MRS spectrum of Sz~114, an accreting M5 star surrounded by a large dust disk with a shallow gap at $\sim 39$ au. The spectrum is molecular-rich: we report the detection of water, CO, CO$_2$, HC…
View article: X-ray, Near-Ultraviolet, and Optical Flares Produced By Colliding Magnetospheres in The Young High-Eccentricity Binary DQ Tau
X-ray, Near-Ultraviolet, and Optical Flares Produced By Colliding Magnetospheres in The Young High-Eccentricity Binary DQ Tau Open
DQ Tau is a unique young high-eccentricity binary system that exhibits regular magnetic reconnection flares and pulsed accretion near periastron. We conducted NuSTAR, Swift, and Chandra observations during the July 30, 2022 periastron to c…
View article: Twenty-five Years of Accretion onto the Classical T Tauri Star TW Hya
Twenty-five Years of Accretion onto the Classical T Tauri Star TW Hya Open
Accretion plays a central role in the physics that governs the evolution and dispersal of protoplanetary disks. The primary goal of this paper is to analyze the stability over time of the mass accretion rate onto TW Hya, the nearest accret…
View article: Twenty-Five Years of Accretion onto the Classical T Tauri Star TW Hya
Twenty-Five Years of Accretion onto the Classical T Tauri Star TW Hya Open
Accretion plays a central role in the physics that governs the evolution and dispersal of protoplanetary disks. The primary goal of this paper is to analyze the stability over time of the mass accretion rate onto TW Hya, the nearest accret…
View article: TW Hya STIS Spectral Imaging
TW Hya STIS Spectral Imaging Open
2-D spectral image from HST PID 11607 (PI: T. Bethell)
View article: TW Hya STIS Spectral Imaging
TW Hya STIS Spectral Imaging Open
2-D spectral image from HST PID 11607 (PI: T. Bethell)
View article: TW Hya STIS Spectral Imaging
TW Hya STIS Spectral Imaging Open
2-D spectral image from HST PID 11607 (PI: T. Bethell)
View article: The Radial Distribution and Excitation of H<sub>2</sub> around Young Stars in the HST-ULLYSES Survey
The Radial Distribution and Excitation of H<sub>2</sub> around Young Stars in the HST-ULLYSES Survey Open
The spatial distribution and evolution of gas in the inner 10 au of protoplanetary disks form the basis for estimating the initial conditions of planet formation. Among the most important constraints derived from spectroscopic observations…