XRISM XTEND observation 201047010

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Xtend spectrum

p0300: All four CCDs in full window mode

p0300: All four CCDs in full window mode

Xtend light curve

Light curve

Light curve

Title

DISK IONIZATION AND PLANET FORMATION STUDIED BY OBSERVATIONS OF THE PROTOSTAR ELIAS 29 AND 9 PRE-MAIN-SEQUENCE STARS

Abstract

Stellar X-ray activity can induce chemical reactions in the protoplanetary disk and affect planet formation. The low-ionized Fe line at ~ 6.4 keV can be a good tracer of the X-ray penetration depth toward the disk, which can reveal the ionization process of surrounding envelope and disk by coronal X-rays. We propose a 100 ks observation of the protostar Elias 29 with Resolve to estimate the X-ray penetration depth and confirm the Fe line is formed from the disk. Using the same pointing, we also use Xtend, which simultaneously observes 9 surrounding pre-main-sequence stars. From this, we can provide the constraint on the line formation region from another viewpoint, by combining the Fe line equivalent widths and the disk inclination angles from the high spatially-resolved ALMA data.

FITS header

TELESCOP= 'XRISM   '           / Mission name
INSTRUME= 'XTEND   '           / Instrument name
OBS_ID  = '201047010'          / Observation identification string
OBJECT  = 'ELIAS29 '           / Object name
OBSERVER= 'SHUN INOUE'         / PI name
OBS_MODE= 'POINTING'           / POINTING or SLEW or ALL
RA_OBJ  =             246.7893 / [deg] Object Right ascension
DEC_OBJ =             -24.6219 / [deg] Object Declination
RA_PNT  =     246.792046161864 / Pointing RA
DEC_PNT =    -24.6203088544854 / Pointing DEC
RA_NOM  =     246.789949973169 / [deg] Nominal aspect point R.A.
DEC_NOM =    -24.6220331005363 / [deg] Nominal aspect point Dec.
PA_NOM  =     278.055210444295 / [deg] Nominal aspect point roll.
TELAPSE =     68857.1991789937 / Elapsed time
DATE-OBS= '2025-08-13T01:07:12.800821' / Start date
DATE-END= '2025-08-13T20:14:50' / Stop date
ONTIME  =         36396.000677 / On-source time
EXPOSURE=         36396.000677 / Exposure time
PROCVER = '03.02.014.010'      / Processing script version
MKFFF   = 'ISAS/JAXA'          / Origin of First FITS file
ORIGIN  = 'GSFC/NASA'          / Origin of Processed FITS file
SOFTVER = 'Hea_12Mar2025_V6.35_XRISM_28Feb2025_V002' / Version of HEADAS used
CALDBVER= 'gen20241115_xtd20241115_rsl20241115' / Version of CALDB used
DATE    = '2025-08-21T07:08:02' / Date and time this file was created or updated
SIB2_VER= 'V04.00  '           / SIB2 version JAXA

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