Detecting solar g-modes with ASTROD

TL;DR

This paper evaluates ASTROD's potential to detect solar g modes via gravitational signals, suggesting it may outperform LISA due to better sensitivity at low frequencies.

Contribution

It provides an updated assessment of ASTROD's capability to detect solar g modes, highlighting its advantages over LISA in the low-frequency range.

Findings

ASTROD's sensitivity is optimized for 100-300 micro Hertz.

LISA's ability to detect g modes remains uncertain.

ASTROD may enable unambiguous detection of solar g modes.

Abstract

We present an up-to-date estimate for the prospect of using the Astrodynamical Space Test of Relativity using Optical Devices (ASTROD) for an unambiguous detection of solar g modes (f < 400 micro Hertz) through their gravitational signature. There are currently two major efforts to detect low-frequency gravitational effects, ASTROD and the Laser Interferometer Space Antenna (LISA). Using the most recent g mode surface amplitude estimates, both observational and theoretical, it is unclear whether LISA will be capable of successfully detecting these modes. The ASTROD project may be better suited for detection as its sensitivity curve is shifted towards lower frequencies with the best sensitivity occurring in the range 100-300 micro Hertz.